diff --git "a/KtE0T4oBgHgl3EQfzgKz/content/tmp_files/load_file.txt" "b/KtE0T4oBgHgl3EQfzgKz/content/tmp_files/load_file.txt" new file mode 100644--- /dev/null +++ "b/KtE0T4oBgHgl3EQfzgKz/content/tmp_files/load_file.txt" @@ -0,0 +1,2455 @@ +filepath=/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf,len=2454 +page_content='Draft version January 10, 2023 Typeset using LATEX twocolumn style in AASTeX631 Molecular Mapping of DR Tau’s Protoplanetary Disk, Envelope, Outflow, and Large-Scale Spiral Arm Jane Huang,1, ∗ Edwin A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Bergin,1 Jaehan Bae,2 Myriam Benisty,3 and Sean M.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andrews4 1Department of Astronomy, University of Michigan, 323 West Hall, 1085 S.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' University Avenue, Ann Arbor, MI 48109, United States of America 2Department of Astronomy, University of Florida, Gainesville, FL 32611, United States of America 3Univ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France 4Center for Astrophysics | Harvard & Smithsonian, 60 Garden St.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Cambridge, MA 02138, USA ABSTRACT DR Tau has been noted for its unusually high variability in comparison with other T Tauri stars.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Although it is one of the most extensively studied pre-main sequence stars, observations with millimeter interferometry have so far been relatively limited.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We present NOEMA images of 12CO, 13CO, C18O, SO, DCO+, and H2CO toward DR Tau at a resolution of ∼ 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5′′ (∼ 100 au).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In addition to the protoplanetary disk, CO emission reveals an envelope, a faint asymmetric outflow, and a spiral arm with a clump.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The ∼ 1200 au extent of the CO arm far exceeds that of the spiral arms previously detected in scattered light, which underlines the necessity of sensitive molecular imaging for contextualizing the disk environment.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The kinematics and compact emission distribution of C18O, SO, DCO+, and H2CO indicate that they originate primarily from within the Keplerian circumstellar disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The SO emission, though, also exhibits an asymmetry that may be due to interaction with infalling material or unresolved substructure.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The complex environment of DR Tau is reminiscent of those of outbursting FUor sources and some EXor sources, suggesting that DR Tau’s extreme stellar activity could likewise be linked to disk instabilities promoted by large-scale infall.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Keywords: protoplanetary disks—ISM: molecules—stars: individual (DR Tau) 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' INTRODUCTION In the classic schema of low-mass star formation, young stellar objects (YSOs) are divided into four classes (0, I, II, and III) based on their spectral energy distributions (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Lada & Wilking 1984;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Lada 1987;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andre et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1993).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' These classes are generally thought to correspond to different evolutionary stages, such that a Class 0 YSO has an envelope mass comparable to or greater than that of the protostar (and its possible disk), a Class I YSO has an envelope that is less massive than the protostar but still comparable to its disk, a Class II YSO has a disk with negligible envelope material, and a Class III YSO has negligible amounts of remaining circumstellar material (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Wilking et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1989;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andre & Montmerle 1994;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Dunham et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The corre- spondence between SED class, evolutionary stage, and morphology, though, is known to be imperfect (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Ro- bitaille et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2006).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Corresponding author: Jane Huang jnhuang@umich.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='edu ∗ NASA Hubble Fellowship Program Sagan Fellow Planet formation models often adopt the characteris- tics of envelope-free Class II disks as a starting point (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', ¨Oberg et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011a;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Lambrechts & Johansen 2012;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Zhang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, scattered light and molec- ular imaging have yielded identifications of a number of Class II disks that appear to be interacting either with (remnant) envelopes or ambient cloud material (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Grady et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1999;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Ginski et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The pace of these identifications has increased with the advent of instruments such as ALMA and VLT/SPHERE.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Detections of gaps and rings in the millimeter continuum of some Class II disks that ap- pear to have remnant envelope material, and even a few embedded Class I disks, offer evidence that planet for- mation can take place under more dynamically complex conditions than typically assumed (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', ALMA Part- nership et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2015;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Segura-Cox et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Kanagawa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Moreover, Currie et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) recently detected a protoplanet in the disk of AB Aur, a system that appears to still be undergo- ing infall from a remnant envelope (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Tang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2012).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Simulations suggest that accretion of cloud or envelope material by the disk can influence its thermal structure, surface density profile, stability, and degree of misalignment (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Bae et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2015;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Dullemond et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' arXiv:2301.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='02674v1 [astro-ph.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='SR] 6 Jan 2023 2 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Kuznetsova et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' These disk conditions, in turn, are expected to influence where, when, and how planets form and migrate, as well as their composition (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Stevenson & Lunine 1988;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Boss 1997;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Kokubo & Ida 2002).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Hence, observations of the immediate envi- ronments of young stars are essential to establish the range of circumstances under which planet formation might proceed.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Recent observations of DR Tau (J2000 04:47:06.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='215+16:58:42.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='81), a T Tauri star located at a distance of 192 ± 1 pc in the Taurus star-forming re- gion (Gaia Collaboration et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Bailer-Jones et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021), have suggested that its disk is being externally perturbed.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) detected spiral arms in scattered light images of the DR Tau protoplanetary disk and hypothesized that one of them was triggered by infalling material.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Meanwhile, Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) detected non-Keplerian emission in ALMA observations of 13CO and [C I] toward DR Tau, attributing this component to an infalling stream of gas.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau is perhaps best known for its unusual degree of stellar variability.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The star has faded and bright- ened in B-band by several magnitudes over the course of almost a century (Chavarria-K.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1979).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Most notably, DR Tau brightened in B-band by about five magni- tudes between 1970 to 1979, an event that Chavarria- K.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (1979) compared to the outbursts of FUor (also known as FU Ori) sources.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau also exhibits sig- nificant short-term spectroscopic and photometric vari- ability—on timescales of a few days, DR Tau has been observed to change by up to a couple magnitudes in B- band and by up to a factor of a few in its optical line fluxes (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Bertout et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1977;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Guenther & Hessman 1993;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Alencar et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2001).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau has a high stellar mass accretion rate of 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 × 10−7 M⊙ yr−1 (McClure 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This high accretion level leads to significant con- tinuum veiling, which poses a challenge for determining its spectral type (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Cohen & Kuhi 1979).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Spectral type estimates have ranged from M0 to K4 (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Imhoff & Appenzeller 1987;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Herczeg & Hillenbrand 2014;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mc- Clure 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Gangi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau was part of the original list of outbursting EXor variables by Herbig (1989), although it has not always been included in subsequent compilations of EX- ors (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Audard et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau is unique among the EXors listed in the Herbig (1989) catalog in that the 18-year rise time to its outburst was much longer than those of the other EXors, which were typically on the order of a couple hundred days.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' EXors are usually distinguished from outbursting FUor sources insofar as EXor outbursts tend to be more modest in magnitude and duration, and EXors have T Tauri-like spectra dur- ing outbursts rather than the supergiant-like spectra of FUors (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Audard et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Several hypothe- ses have been proposed to account for the outbursts of young stars, including disk instabilities driven by mass buildup through infall from envelopes or cloud material, binary interactions, and stellar flybys (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Bonnell & Bastien 1992;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Vorobyov & Basu 2005;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Zhu et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2010;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Forgan & Rice 2010;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Bae et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Dullemond et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Because these outbursts affect the disk thermal structure, they may significantly affect how planet for- mation proceeds by altering molecular abundances, dust properties, and snowline locations (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Juh´asz et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2012;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Banzatti et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2012;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Cieza et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' van ’t Hoff et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Jørgensen et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The hypothesized connection between outbursts and environmental inter- actions further motivates an examination of DR Tau’s surroundings.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Although DR Tau has been a popular target for obser- vations ranging from infrared to ultraviolet wavelengths (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Kenyon et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1994;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Ardila et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2002;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Salyk et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2008;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Pontoppidan et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Banzatti et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014, and references above), relatively few observations with mil- limeter interferometry have been reported.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The mil- limeter continuum, which traces the distribution of large dust grains, has been imaged on several occasions (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Kitamura et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2002;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andrews & Williams 2007;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Taz- zari et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The millimeter con- tinuum emission is fairly compact, with 95% of the flux contained within a 53 au radius (Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Al- though no substructures are immediately apparent in the highest resolution image to date (tracing scales down to ∼ 20 au), modeling of the visibilities suggests the presence of gaps and rings that may be associated with planet-disk interactions (Jennings et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Other than 13CO, C18O, and [C I] (Braun et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022), no interferometric line observations of DR Tau have previously been published.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The upgraded wideband capabilities of the Northern Extended Millimeter Array (NOEMA) provided an op- portunity to observe a number of lines simultaneously toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We obtained sensitive observations of 12CO, 13CO, C18O, SO, DCO+, and H2CO at a resolu- tion of ∼ 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5′′ (∼ 100 au) to map DR Tau’s structure.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The observations and data reduction are summarized in Section 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The molecular detections are analyzed in Section 3, and the implications of DR Tau’s complex structures are discussed in Section 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The summary and conclusions are presented in Section 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' OBSERVATIONS AND DATA REDUCTION DR Tau was observed with the NOEMA PolyFiX correlator in dual polarization mode during program W20BE (PI: J.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The correlator setup covered frequencies from 213.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9-221.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 GHz and 229.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4-237.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 GHz at a resolution of 2 MHz.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Within these frequency ranges, we placed a series of chunks, each with a resolution of 62.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 kHz and width of 64 MHz, in order to resolve molec- ular lines of interest (detailed further in Section 3 and Appendix A).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The first set of observations was executed in C config- uration on 2021 January 08, with baseline lengths rang- ing from 24 to 328 m.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The second set of observations Molecular Mapping of DR Tau 3 was executed in A configuration on 2021 March 03, with baseline lengths ranging from 32 to 760 m.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Each con- figuration used eleven antennas.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For each set of obser- vations, LkHα 101 served as the flux calibrator, 3C 84 served as the bandpass calibrator, and 0446+112 and 0507+179 served as the phase calibrators.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The on-source time was 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 hours in C configuration and 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 hours in A configuration.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The raw data were calibrated with the NOEMA pipeline in CLIC, which is part of the GILDAS package (Pety 2005;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Gildas Team 2013).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Then, the following steps were performed with the GILDAS MAPPING software.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The calibrated visibilities were written out to separate uv-tables corresponding to the low spectral resolution, wide bandwidth data and the high spectral resolution, narrow bandwidth spectral windows.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' After flagging of channels with strong line emission, the wide bandwidth uv-tables were spectrally averaged to produce contin- uum uv-tables.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For each of the four basebands, the continuum was imaged with the CLEAN algorithm and three phase self-calibration loops were performed using solution intervals of 180, 90, and 45 seconds.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The self- calibration solutions were then applied to the uv-tables for the narrow spectral windows that fell within the cor- responding basebands.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Continuum subtraction was per- formed for each spectral window separately in the uv plane by fitting a linear baseline.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The self-calibrated, continuum-subtracted uv tables were converted to measurement sets to enable imag- ing with the Common Astronomy Software Applica- tions (CASA) 6.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 (CASA Team et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Because GILDAS outputs frequencies in the rest frame of the source (i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', the frequency that corresponds to the source systemic velocity input by the observer is the rest fre- quency of the line of interest), we had to manually cor- rect the frequencies in the measurement sets so that CASA would output image cubes with the appropri- ate LSRK velocities.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Each line was imaged with the tclean implementation of the multi-scale CLEAN al- gorithm (Rau & Cornwell 2011).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We set the robust value to 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 and and the image cube channel spacing to 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' To accommodate the irregular mor- phology of the 12CO and 13CO J = 2 − 1 emission, we employed the auto-multithresh algorithm (Kep- ley et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020) to define the CLEAN masks, choos- ing the following parameter values after some experi- mentation: sidelobethreshold=2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, noisethreshold=4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, minbeamfrac=0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3, and negativethreshold=7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Initial imaging tests yielded prominent striping artifacts due to the poor uv sampling of the spatially extended cloud emission, so we re-imaged these lines without baselines shorter than 20 kλ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For the other molecules, where only compact emission was detected, we used a circu- lar CLEAN mask with a radius of 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6′′ and included all baselines.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' A Gaussian uv taper of 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0′′ was used to in- crease sensitivity to weaker lines (i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', lines other than 12CO, 13CO, C18O, SO, DCO+, and H2CO JKaKc = 303 − 202).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' After CLEANing, a primary beam correc- tion was applied to each image cube.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Calibrated visibilities and images can be down- loaded at https://zenodo.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='org/record/7370498# .' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='Y7U-qezMKeB.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' RESULTS 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Overview of Line Observations The primary line targets were 12CO, 13CO, C18O, SO, DCO+, and H2CO.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The CO isotopologues serve as gas tracers, SO is a potential shock tracer (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Pineau des Forˆets et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1993), and H2CO and DCO+ are common cold disk gas tracers (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Pegues et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The synthesized beam and per-channel rms (estimated from line-free channels) for the primary line targets are listed in Table 1, and channel maps are pre- sented in Appendix B.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Spectra for the detected lines, which were extracted using circular masks with diam- eters listed in Table 1, are shown in Figure 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Since the spatial extent of 12CO and 13CO are ambiguous due to spatial filtering and cloud contamination, we used extraction masks approximately equal to the primary beam FWHM at 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 mm (21′′).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The mask sizes for the other lines were chosen based on the approximate radial extent of the 3σ emission in the image cubes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Fluxes were measured by integrating each spectrum within the velocity ranges listed in Table 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The velocity integra- tion ranges for the CO isotopologues were selected based on where emission above the 3σ level is detected.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For the weaker lines, the C18O velocity integration range was adopted.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The 1σ flux uncertainties were estimated as ∆v × √ N × σspec, where ∆v is the channel width (in km s−1), N is the number of channels spanned by the line, and σspec is the standard deviation (in Jy) mea- sured from a signal-free portion of the spectrum (this is not to be confused with the per-channel rms value listed in Table 1 (in mJy beam−1), which is calculated from the image cube).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, the statistical uncertainties do not capture the true uncertainty of the fluxes for 12CO and 13CO, which are affected by cloud contamination and spatial filtering.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We categorize a line as detected if emission is above the 5σ level within 2′′ of DR Tau in at least one channel of the image cube and above the 3σ level in at least two adjacent channels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' By these criteria, 12CO, 13CO, C18O, SO, DCO+, and H2CO 303 − 202 are firmly detected.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' While H2CO 321 − 220 does not meet these criteria, its integrated flux is ⪆ 4σ when extracted over the same ve- locity range and emitting region as the strong 303 − 202 transition, so this line is considered to be tentatively de- tected.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The channel maps for the 322 − 221 transition (Appendix B) show 4σ emission at 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 kms−1 that is cospatial with the stronger 303 − 202 transition, but the velocity-integrated flux from the spectrum is < 2σ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Fur- thermore, the peak of the spectrum occurs at a velocity 4 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Table 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Imaging Summary for Primary Line Targets Transition Synthesized beam Per-channel RMS noisea Velocity rangeb Extraction Mask Diameter Fluxc (arcsec × arcsec (◦)) (mJy beam−1) (km s−1) (arcsec) (mJy km s−1) 12CO J = 2 − 1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='79 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='47 (18.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2◦) 7 [−2, 17] 21 37900 ± 200d 13CO J = 2 − 1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='84 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='49 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3◦) 6 [7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6, 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4] 21 5730 ± 70d C18O J = 2 − 1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='85 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3◦) 6 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 4 622 ± 10 SO JN = 65 − 54 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='85 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2◦) 6 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 195 ± 9 SO JN = 55 − 44 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='86 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1◦) 6 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 96 ± 10 DCO+ J = 3 − 2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='86 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1◦) 6 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 40 ± 10 H2CO JKaKc = 303 − 202 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='86 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2◦) 6 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 248 ± 11 H2CO JKaKc = 322 − 221 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='20 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1◦) 7 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 < 30 H2CO JKaKc = 321 − 220 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='20 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1◦) 7 [9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0, 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8] 3 38 ± 8 aWith channel widths of 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' b LSRK velocity range over which moment maps are produced and the flux is estimated.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' c The 1σ error bars do not include the systematic flux uncertainty (∼ 10%).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' dThese lines are significantly affected by spatial filtering, so the statistical uncertainty does not reflect the true uncertainty in the fluxes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' well offset from the peak of the 303 − 202 and 321 − 220 lines.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Therefore, we do not consider the 322 − 221 tran- sition to be detected.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Integrated intensity maps of the primary line targets are presented in Figure 2, using the velocity integration ranges listed in Table 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The intensity-weighted veloc- ity maps of the stronger lines are presented in Figure 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For 12CO and 13CO, the integrated intensity maps excluded pixels in the image cube below the 3σ level and the intensity-weighted velocity map excluded pix- els below the 6σ level in order to reduce contributions from cloud contamination and artifacts from spatial fil- tering.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For all other lines, no clipping was used for the integrated intensity maps, and a 4σ clip was adopted for the intensity-weighed velocity maps.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' A summary of the auxiliary line observations (none of which yielded a detection) is presented in Appendix C.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Structures traced by CO isotopologues Due to their differing optical depths, the three de- tected CO isotopologues reveal different components of the DR Tau system, including the circumstellar disk, an arm, an envelope, and an outflow.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' An overhead car- toon schematic of the system is shown in Figure 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We describe each component in further detail below.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The circumstellar disk C18O is the least optically thick of the three detected CO isotopologues and therefore best traces the Keple- rian rotation of the circumstellar disk (see Figure 3).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The southern side is blueshifted and the northern side is redshifted relative to the systemic velocity, which Braun et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2021) estimated to be vsys = 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='08 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='09 km s−1 from ALMA observations of 13CO and C18O J = 2−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Signs of Keplerian rotation are visible in the inner regions of the NOEMA 13CO intensity-weighted velocity map and coincide with the bright, compact emission component in the integrated intensity map, but the disk edge is not well-defined due to the presence of extended, non- Keplerian emission.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' From visual inspection of the 13CO emission, we estimate that the Keplerian disk has a ra- dial extent of ∼ 300 au, but this should only be consid- ered a lower bound for the disk size because the abun- dance of 13CO is generally too low in the outer disk to recover the disk size robustly (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Trapman et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Finally, 12CO is dominated by large-scale, non- Keplerian structures.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The NOEMA observations do not strongly constrain the disk orientation, since the C18O emission is spanned by only a few synthesized beams.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2019) measured a position angle (P.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=') of 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4+8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 −8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 de- grees east of north and an inclination angle of 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4+2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 −2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 degrees from ALMA millimeter continuum observations at an angular resolution of ∼ 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1′′, which corresponds to ∼ 20 au.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We adopt these values for our analysis.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Although our new 12CO and 13CO observations show significant non-disk emission, Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) found that their ALMA C18O observations could be largely re- produced by a Keplerian disk model employing the disk orientation derived from Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Because the disk is nearly face-on, the C18O spectrum only exhibits a single peak at the systemic velocity rather than the double-peak characteristic of more inclined disks.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Molecular Mapping of DR Tau 5 5 0 5 10 15 20 25 LSRK Velocity (km s 1) 0 5 10 15 20 25 Flux (Jy) 12CO 2-1 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 LSRK Velocity (km s 1) 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 Flux (Jy) 13CO 2-1 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 LSRK Velocity (km s 1) 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='00 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='25 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='50 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='75 Flux (Jy) C18O 2-1 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 LSRK Velocity (km s 1) 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 Flux (Jy) SO 65 54 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 LSRK Velocity (km s 1) 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='05 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='00 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='05 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='10 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='15 Flux (Jy) SO 55 44 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 LSRK Velocity (km s 1) 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='04 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='00 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='04 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='08 Flux (Jy) DCO + 3 2 5.' metadata={'source': 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'/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='Figure 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Integrated intensity maps of primary line targets observed toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The synthesized beam is drawn in the lower left corner of each panel.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Black crosses mark the disk center.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The axes show offsets from the disk center in arcseconds.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For the CO isotopologues, the color scale uses an arcsinh stretch to make faint extended features more visible.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Note that the size scales are different between the top row and the other rows.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Molecular Mapping of DR Tau 7 8 4 0 4 8 8 4 0 4 8 12CO 2 1 200 au 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 8 4 0 4 8 8 4 0 4 8 13CO 2 1 200 au 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 Intensity-weighted velocity (km s 1) 2 1 0 1 2 2 1 0 1 2 C18O 2 1 200 au 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content="5 2 1 0 1 2 [''] 2 1 0 1 2 [''] SO 65 54 200 au 9." metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 2 1 0 1 2 2 1 0 1 2 SO 55 44 200 au 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 2 1 0 1 2 2 1 0 1 2 H2CO 303 202 200 au 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 Figure 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Intensity-weighted velocity maps of strong lines detected toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The synthesized beam is drawn in the lower left corner of each panel.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The purple cross denotes the disk center.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The axes show offsets from the disk center in arcseconds.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Note that the velocity ranges and size scales are not the same for all imags.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Blueshifted spiral arm The intensity-weighted velocity maps for 12CO and 13CO (Figure 3) both show an arm that is blueshifted with respect to the systemic velocity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' To isolate the emission from the CO arm, we produced integrated in- tensity maps between 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 and 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 km s−1 (Figure 5).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The arm is connected to the south side of the disk and curves around the western side, terminating at a pro- jected distance of ∼ 1200 au from DR Tau at a P.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' of ∼ 330◦.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The 12CO emission also shows a clump along the arm at a projected distance of ∼ 500 au southwest from DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This arm was not detected in previously published high-resolution ALMA 13CO images of DR Tau (Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022), presumably due to some com- bination of lack of sensitivity and spatial filtering.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' How- ever, low angular resolution ALMA ACA observations of [C I] from Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) show extended blueshifted emission, which may originate from the arm traced by CO in our NOEMA observations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In order to estimate the pitch angle of the arm, we transformed the integrated intensity map of the arm into a polar coordinate map (i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', as a function of deprojected radius R and polar angle θ), assuming that the arm is in the plane of the disk (Figure 6).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We then measured the position of the spiral arm by searching for local radial maxima in the polar coordinate map for fixed values of θ in steps of 8◦ from 124◦ to 260◦.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The arm was modelled as an Archimedean spiral of the form R(θ) = a + cθ3, where θ is in radians.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (We found that logarithmic spirals and Archimedean spirals with smaller exponents did not fit the data well).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The log-likelihood function was spec- ified as log L = −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 � n � (Rdata−Rmodel)2 σ2 + log(2πσ2) � , where σ is the standard deviation of the major axis of the synthesized beam.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Uniform priors of [0, 2000] and [−2000, 0] were used for a and c, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Posteriors were explored using the affine-invariant sampler emcee (Goodman & Weare 2010;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Foreman-Mackey et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2013) with 40 walkers and 1000 steps.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' After discarding the first 500 steps as burn-in, we computed the 50th per- 8 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Outflow Disk Blueshifted arm Line of Sight EAST WEST Envelope Figure 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' A proposed cartoon schematic of the DR Tau system from an overhead perspective (i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', perpendicular to the line of sight).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The components are not drawn to scale.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Note that while the disk is drawn such that the east side is tilted toward the observer in order to show that the disk is slightly inclined, the observations do not constrain which side is closer to the observer.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The 3-dimensional orientations of the envelope and the arm are not known in detail, but the former is drawn in front of the disk and the latter is drawn behind the disk (from the perspective of the observer) under the assumption of infalling motion.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, the observations may also be explained by other configurations of the structures.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=" 6 3 0 3 6 [''] 6 3 0 3 6 [''] 12CO J = 2 1 (8." metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4-9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 km s 1) Clump 200 au 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 50.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 100.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 150.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 250.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 6 3 0 3 6 6 3 0 3 6 13CO J = 2 1 (8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4-9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 km s 1) 200 au 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 6.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 18.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 24.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 Integrated Intensity (mJy beam 1 km s 1) Figure 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Integrated intensity maps of 12CO (left) and 13CO, summed up between 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 and 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 km s−1 to highlight DR Tau’s blueshifted spiral arm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The blue cross marks the center of the disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The synthesized beam is shown as a white ellipse in the lower left corner of each panel.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The 12CO color scale is saturated in order to show the fainter arm emission more clearly.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=" Molecular Mapping of DR Tau 9 0 300 600 900 1200 Deprojected radius (au) 0 60 120 180 240 300 360 (degrees) 6 4 2 0 2 4 6 [''] 6 4 2 0 2 4 6 [''] 120 150 180 210 240 270 (degrees) 0 15 30 45 60 75 Pitch angle (degrees) Figure 6." metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Left: Integrated intensity map of the 12CO arm, replotted as a function of deprojected radius and polar angle θ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Center: Integrated intensity map of the 12CO arm, overplotted with the spiral function defined by the posterior median values of the spiral parameters.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Right: Pitch angle of the arm as a function of the polar angle θ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The black curve corresponds to the values derived from the median of the spiral arm parameter posteriors, while the blue curves correspond to 1000 random draws from the posterior.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 10 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' centile of the marginal posterior distribution to obtain a point estimate and the 16th and 84th percentiles to ob- tain error estimates: a = 1060±30 au and c = −7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8±0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 au.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We computed the pitch angles (φ = arctan ��� 1 R dR dθ ��) � corresponding to the median values of a and c, then also computed pitch angles for spiral curves defined by 1000 random draws of (a, c) from the posterior.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Figure 6 shows the median spiral plotted over the integrated intensity map and a plot of the derived pitch angles as a function of polar angle θ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The pitch angles range from 6 to 56 degrees between polar angle values of 124 to 260 degrees (corresponding to deprojected radius values between 980 and 330 au).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In other words, the pitch angle appears to decrease with distance from the star, although the true values may differ if the assumption that the arm is in the plane of the disk is incorrect.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We computed the escape velocity, vesc = � 2GM∗ r , at the tip of the arm to assess whether it is gravitationally bound to DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The dynamical mass of DR Tau has been measured to be 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 M⊙ (Braun et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Emission from the arm is detected up to r ∼ 1200 au at an LSRK velocity of 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 km s−1, which is offset from the systemic velocity by 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The corresponding escape velocity at r = 1200 au is 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Thus the arm appears to be compatible with being gravitationally bound to DR Tau, but not definitively so, since there may also be a transverse velocity component.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) recently identified two spiral arms in SPHERE H-band Qφ observations of DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Figure 7 compares the arms identified in the SPHERE image to the CO arm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The CO arm is much more extended than the scattered light arms, which are only detected up to ∼ 220 au in projection from the star.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Because the NOEMA synthesized beam is comparable in scale to the SPHERE spiral arms, it is not clear whether the CO arm is an extension of one of the arms detected in scattered light or a separate structure.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) mea- sured pitch angles of 11◦ and 26◦ for the two scattered light arms, which are smaller than the pitch angle mea- sured for the inner region of the CO arm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, since the pitch angles appear to change along the arm, the differing values do not necessarily imply that they are separate structures.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) also noted that the northeastern spiral in the SPHERE image had a clump-like feature, which they hypothesized was asso- ciated with a protoplanet embedded in a dusty envelope.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' While this compact feature is well below the resolution limits of our NOEMA observations, the presence of a dif- ferent clump in the 12CO arm suggests that the clumps could be intrinsic features of the arms themselves.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Envelope DR Tau shows envelope emission in 12CO up to ∼ 5′′ (1000 au) in projection from the star (Figure 8).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' En- velope emission is detected between 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 and 12 km s−1, i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', mostly redshifted with respect to the systemic ve- locity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In most of these channels, the envelope emission is more spatially extended and brighter on the northern side.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' As with 12CO, the 13CO emission is more extended north of the star compared to south of the star for LSRK velocities above 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In contrast to 12CO, though, the 13CO maps show features that ap- pear more streamer-like than envelope-like.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, since this is the velocity range where cloud contamina- tion is most significant, spatial filtering of large-scale emission may be artificially creating the appearance of streamers.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) identified a possible in- falling stream in ALMA observations of 13CO toward DR Tau, but those observations were likewise affected by spatial filtering.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Observations of other lines that are bright but less susceptible to cloud contamination (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', species with higher critical densities like HCO+ or CO transitions with higher upper energy levels) might help to clarify the nature of these apparent streamers.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The channels where envelope emission is detected in 12CO overlap with the channels where [C I] exhibits a redshifted non-Keplerian component that Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) attributed to an infalling stream.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, since the beam FWHM of the [C I] observations is ∼ 3′′, most of the emission is spatially unresolved.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Given the simi- lar velocities to the 12CO envelope, it is likely that the redshifted non-Keplerian [C I] emission also originates from the envelope.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Outflow DR Tau’s 12CO spectrum (Figure 1) exhibits a faint blueshifted line wing without a corresponding redshifted line wing, suggesting the presence of an asymmetric out- flow.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The channel maps (Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1) show compact emission at LSRK velocities lower than 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' To highlight this compact outflow emission more clearly, we extracted a new 12CO spectrum using a smaller circu- lar aperture with a diameter of 4′′ (Figure 9).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Because DR Tau is nearly face-on, it is not straightforward to separate the outflow emission from the line wings of the Keplerian disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, the asymmetry of the line pro- file allows us to estimate the velocities at which outflow emission dominates by mirroring the outflow spectrum about the systemic velocity and taking the ratio of the original and mirrored spectrum.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We assume that the outflow emission on the blueshifted side dominates when the ratio exceeds 10, which occurs at 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' While the outflow emission is weak in individual channels (Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1), the spatial distribution of the blueshifted side can be better seen by producing an in- tegrated intensity map between −2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 and 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The lower bound of the velocity integration range was determined by where the emission in individual chan- nels drops below 3σ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For comparison, we also produced an integrated intensity map from 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 to 21.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 km s−1, corresponding to the redshifted channels at the opposing offsets from the systemic velocity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The two integrated in- Molecular Mapping of DR Tau 11 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 [′′] 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 [′′] Southern spiral Northeastern spiral H-band Q Clump H-band Q 50 au 6 4 2 0 2 4 6 6 4 2 0 2 4 6 H-band Q vs.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 12CO arm 200 au Figure 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' A comparison between the SPHERE H-band Qφ image of DR Tau from Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) and the 12CO NOEMA observations from this work.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Left: H-band Qφ image of DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The arrows point to the northeastern spiral, southern spiral, and clump identified in Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The gray circle shows the extent of the SPHERE coronagraph.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Right: A contour plot of the 12CO arm overlaid atop the H-band Qφ image.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Note that the size scale is different from the image on the left.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The contours, drawn at 50, 100, and 150 mJy beam−1 km s−1, correspond to the 12CO integrated intensity map from Figure 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' tensity maps are presented in Figure 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The blueshifted map shows relatively compact emission with a radial ex- tent of ∼ 2′′ (∼ 400 au).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Although the opening angle of the outflow cannot be computed because the disk is nearly face-on, the compactness of the emission suggests that the outflow is quite collimated.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The redshifted map shows emission near the stellar position, but given that the redshifted emission is fainter and much more com- pact than the blueshifted outflow, it seems likely that the compact redshifted emission originates from the line wing of the Keplerian disk emission.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' While a redshifted outflow component is not readily visible in the 12CO spectrum, the redshifted map shows a faint ring with a radius of ∼ 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5′′ (∼ 900 au), which is significantly wider than the blueshifted outflow component.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' SO, DCO+, and H2CO emission SO, DCO+, and H2CO emission all originate from a relatively compact region within 300 au of DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The SO 65 − 54, SO 55 − 44, and H2CO 303 − 202 intensity- weighted velocity maps (Figure 3) show velocity gradi- ents similar to that of C18O, indicating that they like- wise (largely) originate from the Keplerian disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The kinematics of DCO+ are not well-defined due to the low signal-to-noise ratio, but the compactness of the emis- sion suggests that it also primarily traces the Keplerian disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' That said, whereas C18O and H2CO 303−202 both ex- hibit relatively axisymmetric emission in the integrated intensity maps (Figure 2) and line profiles that are sym- metric about the systemic velocity (Figure 1), SO 65−54 and 55 − 44 are both asymmetric.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Their emission is stronger on the northern (redshifted) side of the disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In addition, their spectra both peak at an LSRK veloc- ity of 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 km s−1, which is redshifted by 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 km s−1 with respect to the systemic velocity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The DCO+ spec- trum also appears stronger on the redshifted side, but given that its SNR is lower than that of the SO lines, more sensitive observations will be necessary to deter- mine whether the DCO+ asymmetry is genuine.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DISCUSSION 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The evolutionary stage of DR Tau DR Tau is traditionally considered to have a Class II SED, with stellar age estimates ranging from 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 to 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 Myr (Kenyon & Hartmann 1995;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' McClure 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The presence of the envelope, if primordial, would suggest that the younger end of the age range is more likely.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau’s chemistry also appears to point to a younger age.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Although SO is detected in DR Tau, it has otherwise rarely been detected in Class II disks, 12 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 6 3 0 3 6 [′′] 6 3 0 3 6 [′′] 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0 50 100 250 500 12CO J = 2 1 intensity (mJy beam 1) 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 6 3 0 3 6 [′′] 6 3 0 3 6 [′′] 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 0 50 100 200 13CO J = 2 1 intensity (mJy beam 1) Figure 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 12CO J = 2 − 1 and 13CO J = 2 − 1 over the velocity range where envelope emission is present.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The black contours denote the 5, 15, 25, and 35σ contours of C18O J = 2 − 1 to serve as a visual reference for the kinematics of the Keplerian disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (Note that because C18O is less abundant than 12CO and 13CO, the Keplerian line wings of C18O are not detected out to as high velocities as the other two isotopologues).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' especially those hosted by T Tauri stars (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Guilloteau et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Semenov et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Le Gal et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' It is commonly detected, though, in younger, embedded Class 0 and I systems (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Sakai et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Le Gal et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mercimek et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In addition, Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) found that gas-phase carbon is not as severely depleted in DR Tau as other Class II disks that have been observed, although it is still more depleted than Class 0/I systems.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, simulations have suggested that pre-main se- quence stars might be able to form second-generation en- velopes through interaction with cloud material, a pro- cess sometimes referred to as “late infall” (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Dulle- mond et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Kuffmeier et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Indeed, Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) hypothesized that DR Tau was undergo- ing late infall based on the detection of spiral arms in scattered light.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=" Given the range of ages estimated for DR Tau, it is ambiguous whether infall onto DR Tau should be considered “late.” As noted above, DR Molecular Mapping of DR Tau 13 0 10 20 LSRK Velocity (km s 1) 2 0 2 4 6 8 10 12 Flux (Jy) 12CO inner 4′′ 9 6 3 0 3 6 9 [''] 9 6 3 0 3 6 9 [''] 2." metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 to 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s 1 0 100 200 300400 Integrated Intensity (mJy beam 1 km s 1) 9 6 3 0 3 6 9 9 6 3 0 3 6 9 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 to 21.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 km s 1 0 50 100 150 Figure 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Overview of DR Tau’s outflow emission.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Left: 12CO spectrum extracted from a circular aperture with a 4′′ diameter, showing a blueshifted outflow wing.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The approximate velocity range of the blueshifted outflow is shaded in blue.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The purple dotted line marks the system velocity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Middle: 12CO integrated intensity map covering velocities from −2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 to 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Compact emission from the blueshifted side of the outflow is visible.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' An arcsinh stretch is used on the color scale to make faint emission more readily visible.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The faint vertical striping is due to the sidelobes of the point spread function.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The pink cross marks the position of the disk center.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Right: 12CO integrated intensity map covering velocities from 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 to 21.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The map shows a faint ring with a radius of ∼ 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5′′ (∼ 900 au) and compact emission located at the stellar position.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The redshifted compact emission may be from a line wing of the Keplerian disk rather than the outflow.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Tau’s chemistry seems to suggest that the disk is rela- tively young.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This appearance of chemical youthfulness, though, stems from comparisons of Class 0/I sources to isolated Class II disks.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Based on molecular observations of GM Aur, a Class II disk with large-scale spiral arms suggestive of ongoing late infall, Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2021) speculated that accretion of cloud material could par- tially reset disk chemistry such that it bears greater resemblance to that of Class 0/I sources.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The impact of late infall on disk chemistry will need to be examined through astrochemical modeling to determine the extent to which chemical properties can be used to sort disks by relative age.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Given that DR Tau is commonly included in sur- veys of Class II disks because of its relatively large disk mass and bright line emission (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Salyk et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Arulanantham et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022), an erroneous classification of its evolution- ary stage may skew interpretations of disk observations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) remarked that a similar problem exists for DO Tau, another commonly observed Class II disk that also shows signatures of being partially embed- ded.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Interestingly, among the twelve single star systems that Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2019) identified as having “smooth” disks in millimeter continuum emission, at least three of them (DR Tau, DO Tau, and Haro 6-13) exhibit ev- idence of an envelope in spatially resolved CO emission (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Fern´andez-L´opez et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022, and this work).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Most of the remain- ing sources (including both the “smooth” and structured disks) lack high quality interferometric CO observations, so it is unknown whether they might be embedded as well.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Analyses of where and when disk substructures tend to emerge will require sensitive, spatially resolved molecular line observations to provide context about the evolutionary stages of the objects being studied.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Origin of SO in DR Tau The detection of SO in DR Tau is notable given that SO detections have thus far been uncommon in Class II disks, which has been attributed to high gas-phase C/O ratios (> 1) disfavoring SO production (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Guilloteau et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Semenov et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Le Gal et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In two of the disks where SO has been detected, AB Aur and Oph IRS 48, the gas-phase C/O ratio has been esti- mated to be less than 1 (Rivi`ere-Marichalar et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Booth et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Based on thermochemical model- ing of [C I] and CO isotopologue emission, Sturm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) estimated that DR Tau has a gas-phase C/O ra- tio of 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='47.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The detection of SO toward DR Tau is thus qualitatively consistent with SO production in disks be- ing favored in gas with C/O ratios less than 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau’s SO emission exhibits a mild asymmetry that is not seen in C18O.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This suggests that the SO asym- metry is not merely tracing the underlying gas surface density, but could instead be due to some dynamical process locally favoring SO production.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' SO has been proposed to be enhanced by outflows, winds, gravita- 14 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' tional instabilities, or accretion shocks (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Pineau des Forˆets et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1993;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Sakai et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Tabone et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Ilee et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We discuss these possibilities in turn for DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Our NOEMA observations have shown that DR Tau has a molecular outflow, and past CO ro-vibrational spectroscopy indicates that DR Tau has a wide-angle molecular wind (Pontoppidan et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' An outflow shock does not appear to be a likely major contributor to SO in DR Tau, since SO is not detected at the same high velocities as CO.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' At the spatial and spectral resolu- tion of our NOEMA observations, it is unclear whether the SO kinematics are consistent with those expected for a disk wind (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Haworth & Owen 2020), but DR Tau’s bright emission makes it an excellent target for more detailed follow-up.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Chemical modeling of gravitationally unstable disks suggests that gas-phase SO can be enhanced either by spiral shocks or within warm disk fragments (Ilee et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011, 2017).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' While DR Tau does feature spiral struc- ture, Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) argued that DR Tau’s spiral arms are unlikely to be due to gravitational instability given that its disk-to-stellar mass ratio and stellar accre- tion rate are a factor of a few lower than hydrodynamical simulations suggest would be necessary to induce grav- itational instabilities.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Nevertheless, disk mass is notori- ously difficult to measure (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Miotello et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022, and references therein), and studies of other spiral-armed disks have often disagreed on whether they are massive enough to be gravitationally unstable (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', P´erez et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Cleeves et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Veronesi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Sierra et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Higher spatial resolution would help to determine if the SO asymmetry traces spiral structure and/or a disk fragment.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Accretion shocks in protoplanetary disks might oc- cur due to cloud or envelope material being accreted by the disk or disk material being accreted by an em- bedded planet (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Bodenheimer 1974;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Boss & Graham 1993;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Yorke & Bodenheimer 1999;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Szul´agyi & Mordasini 2017).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Accretion streamers traced by SO have been observed in several Class I protostellar systems (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Artur de la Villarmois et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Given that DR Tau is now known to be partially embed- ded, its asymmetric SO emission may arise in a manner similar to Class I systems.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Booth et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) proposed that an SO asymmetry in the HD 100546 disk could be due to shocks from gas accreting onto an embedded planet.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This likely does not account for DR Tau’s SO asymmetry, since high-contrast imaging from Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) rules out the presence of a companion above sev- eral Jupiter masses at separations greater than 50 au from DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Origin of DR Tau’s molecular spiral arm Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) hypothesized that the northeastern spiral arm detected in scattered light toward DR Tau is due to planet-disk interactions, while the southern arm is due to infall from cloud material.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' As noted in Section 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2, the angular resolution of our NOEMA observa- tions does not allow us to determine whether the CO spiral arm is an extension of either scattered light spiral arm, but the very large extent of the molecular arm sug- gests that it is unlikely to be generated by interactions with a bound planet.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) placed an upper limit of several Jupiter masses on any companion farther out than 50 au from DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Given that the millimeter continuum appears smooth down to a resolution of 20 au (Long et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018), it is unlikely that the disk harbors massive (super-Jovian) companions within 50 au.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' More- over, hydrodynamical simulations indicate that external companions exceeding several MJ should create a pair of (nearly) symmetric spiral arms (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Zhu et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2015;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Dong et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016), contrary to what is observed for DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Thus, a stellar companion is also unlikely to be responsible for the arm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' An infalling stream is a plausible explanation for the molecular arm, given that similar large-scale structures have been detected in association with a number of em- bedded Class 0/I sources as well as Class II disks pro- posed to be undergoing late infall (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Tang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2012;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Yen et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Pineda et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Valdivia-Mena et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' One pos- sible difference of note is that the structures proposed to be infalling streams in the other systems have tended to be open, whereas DR Tau’s pitch angle exhibits a marked decrease with distance from the star.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, this apparent difference may simply be a projection ef- fect, since we do not know their three-dimensional ori- entations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' As noted in the previous subsection, it is uncertain whether DR Tau is gravitationally unstable.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The possi- bility that DR Tau’s arm arises from gravitational in- stabilities remains intriguing given that clumpy arms are a hallmark of simulations of fragmenting disks (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Zhu et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2012;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Basu & Vorobyov 2012).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Furthermore, migration of clumps onto stars has been proposed as a trigger for FUor outbursts (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Boley et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2010).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Clump migration might likewise explain DR Tau’s ex- treme brightening event in the 1970s.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' If DR Tau’s disk mass has been estimated correctly, then the presence of a clump along DR Tau’s arm raises the question of whether fragmentation can occur under less stringent conditions than models demand.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Close stellar encounters can also generate large-scale arm-like structures with pitch angles comparable to that observed for the DR Tau molecular arm (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Dai et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2015;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Cuello et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019, 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, Shuai et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) inferred from an analysis of Gaia EDR3 data (Gaia Collaboration et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021) that the closest ex- pected approach between DR Tau and a neighboring star in the past 10,000 years is ∼ 105 au, which would be too distant to meaningfully perturb the known cir- cumstellar environment of DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2022) found that DQ Tau may have passed within 5100 au of Molecular Mapping of DR Tau 15 DR Tau 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='23 Myr ago, but considered such an encounter unlikely to be responsible for DR Tau’s spiral arms be- cause flyby-induced arms are only expected to survive on timescales of several thousand years (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Cuello et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Connections to EXor and FUor phenomena In recent years, the circumstellar environments of a number of FUors and EXors have been spatially resolved with millimeter interferometry and high-contrast scat- tered light imaging.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' FUors are often associated with envelopes, outflows, and arm-like structures (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Liu et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2016;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Zurlo et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Ru´ız-Rodr´ıguez et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' K´osp´al et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2017), similar to the structures associated with DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In FUor systems, the envelopes sup- ply infalling material that may help to activate gravita- tional instabilities (and then possibly magnetorotational instabilities), the arms may form as a consequence of gravitational instabilities, and instabilities may trigger outbursts that subsequently drive outflows (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Evans et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1994;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Vorobyov & Basu 2005;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Zhu et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2010).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' With the exception of EX Lup and V1647 Ori, the latter of which is sometimes considered to be an FUor source, the EXor sources imaged so far have generally lacked analogous features (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Principe et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Hales et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Cieza et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Hales et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' However, DR Tau exhibits striking similarities to EX Lup in that they both feature outflows, non-Keplerian spiral-like struc- tures, and (remnant) envelopes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The circumstellar en- vironments of DR Tau and EX Lup also share similar- ities with that of RU Lup, which is not classified as an EXor source but is nevertheless an exceptionally ac- tive T Tauri star (Joy 1945;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Gahm et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1974;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Hales et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2018) suggested that the pres- ence of complex structures associated with EX Lup but not other EXors is an indication that EX Lup occupies an intermediate evolutionary stage between FUors and most EXors.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The same may hold true for DR Tau (and perhaps RU Lup).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Alternatively, the differences in EXor circumstellar environments may indicate that EXors are a heterogeneous group of objects, only some of which are closely related to the FUor phenomenon.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' In any case, the observations of EX Lup, DR Tau, and RU Lup moti- vate more spatially resolved imaging of extremely active T Tauri stars to elucidate the connection between cir- cumstellar environments and stellar properties.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' A changing view of Class II disks In the past decade, the introduction of high angular resolution imaging at millimeter wavelengths has trans- formed our understanding of planet formation by show- ing that dust substructures on scales of several au are common (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', ALMA Partnership et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2015;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andrews et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Meanwhile, sensitive molecular imaging at more modest resolution has highlighted a deficit in our understanding of disk environments on scales of tens to thousands of au.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' With single-dish telescopes and ear- lier generations of interferometers, signs of large-scale non-Keplerian emission towards Class II disks were of- ten ascribed to foreground contamination (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Thi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2001;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Hughes et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2009;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' ¨Oberg et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2011b).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Even in the era of more powerful millimeter interferometers, in- sufficient integration times or insufficient uv coverage at larger spatial scales can lead to key structures being missed.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' High-quality molecular mapping, though, has demon- strated that there are indeed large-scale tails, spirals, streams, and/or remnant envelopes associated with a number of Class II systems (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Akiyama et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2019;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Paneque-Carre˜no et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Scattered light imaging has also played an important role in uncovering examples of Class II disks that appear to be interacting with surrounding material (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Grady 2004;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Garufi et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Ginski et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021), although as demonstrated by the examples of DR Tau from this work and RU Lup from Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' (2020), molecular observations can reveal structures far beyond the detected extent of scattered light features.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Infall from these larger-scale structures is increasingly being invoked to explain certain disk structures observed at smaller scales, such as misalignments or spiral arms (e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='g.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Ginski et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Paneque-Carre˜no et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2021;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Mesa et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' These observations thus imply an in- triguing link between dynamical processes operating on disparate size scales.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' For individual systems, though, infall is only one of several possible explanations for the observed disk phenomena.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' More systematic molecular line observations will be key for establishing patterns of association between large- and small-scale properties.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' SUMMARY We present new NOEMA observations of 12CO, 13CO, C18O, SO, DCO+, and H2CO toward the T Tauri star DR Tau, representing the highest-quality millimeter line observations of this source to date.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Our findings are as follows: 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' CO emission shows that the DR Tau protoplane- tary disk is associated with an envelope, a faint asymmetric outflow, and a large non-Keplerian spiral arm with a clump.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The molecular spiral arm resembles a scaled-up version of the spiral arms detected in scattered light, although the angular resolution of NOEMA is not sufficient to determine whether the molecu- lar arm is an extension of one of the scattered light arms or a separate feature.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Whereas the scattered light arms are only detected up to ∼ 220 au in projection from DR Tau, the molecular arm is de- tected up to ∼ 1200 au in projection from the star.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We report detections of SO, DCO+, and H2CO in the DR Tau disk for the first time.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Their kinemat- 16 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' ics and compact emission extent suggest that they primarily trace the Keplerian circumstellar disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' SO emission is stronger on the northern, redshifted side of the disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This asymmetry might be linked to infall from an asymmetric envelope or to un- resolved spiral substructure associated with the arms detected in scattered light.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Higher angular resolution observations of SO will be needed to clarify the origins of the asymmetry.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' DR Tau’s envelope, outflow, and arm are reminiscent of the structures that have been observed in association with various FUor sources as well as the EXor source EX Lup.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Given that FUor and EXor outbursts have been linked to instabilities driven by envelope accretion, a similar mechanism may account for DR Tau’s dramatic stellar brightness changes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The NOEMA observations of DR Tau highlight the utility of sensitive, spatially re- solved molecular line observations for providing context about the conditions under which young stars and their protoplanetary disks evolve.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This work is based on observations carried out un- der project number W20BE with the IRAM NOEMA Interferometer.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This work is also based on observations collected at the Euro- pean Southern Observatory under ESO programme(s) 0102.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='C-0453(A).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We thank our NOEMA local contact, Ana Lopez-Sepulcre, for setting up the observing scripts and assisting with data reduction.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We also thank Arthur Bosman, Ke Zhang, Joel Bregman, Lee Hartmann, Merel van’t Hoff, Ardjan Sturm, Melissa McClure, and Ewine van Dishoeck for helpful discussions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' We thank the referee, Ruobing Dong, for helpful comments im- proving the clarity of the manuscript.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Support for J.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' H.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' was provided by NASA through the NASA Hubble Fellowship grant #HST-HF2-51460.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in As- tronomy, Inc.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', for NASA, under contract NAS5-26555.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 101002188).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Facilities: NOEMA Software: analysisUtils (https://casaguides.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='nrao.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' edu/index.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='php/Analysis Utilities), AstroPy (Astropy Collaboration et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2013), CASA (CASA Team et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022), cmasher (van der Velden 2020), emcee (Foreman- Mackey et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2013), GILDAS (Pety 2005;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Gildas Team 2013), matplotlib (Hunter 2007), pandas (pan- das development team 2022;' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Wes McKinney 2010), scikit-image (van der Walt et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2014), SciPy (Vir- tanen et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020) APPENDIX A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' SPECTROSCOPIC PARAMETERS OF TARGETED LINES The spectroscopic parameters of the targeted lines, taken from the Cologne Database for Molecular Spectroscopy (M¨uller et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2001, 2005) via Splatalogue1, are listed in Table 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Primary line targets are marked in bold.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 1 https://splatalogue.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='online// Molecular Mapping of DR Tau 17 Table 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Spectroscopic Parameters of All Targeted Lines Transition Rest frequency Eu (GHz) (K) 13C17O J = 2 − 1 214.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5738730 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 SO JN = 55 − 44 215.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2206530 44.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 DCO+ J = 3 − 2 216.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1125822 20.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7 H2S JKaKc = 220 − 211 216.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7104365 84.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 c-C3H2 JKaKc = 330 − 221 216.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2787560 19.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5 SiO J = 5 − 4 217.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1049190 31.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 DCN J = 3 − 2 217.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2385378 20.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 c-C3H2 JKaKc = 514 − 423 217.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9400460 35.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 H2CO JKaKc = 303 − 202 218.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2221920 21.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 HC3N J = 24 − 23 218.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3247230 131.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 H2CO JKaKc = 322 − 221 218.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4756320 68.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 H2CO JKaKc = 321 − 220 218.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7600660 68.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1 C18O J = 2 − 1 219.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5603541 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 SO JN = 65 − 54 219.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9494420 35.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 13CO J = 2 − 1 220.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3986842 15.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 12CO J = 2 − 1 230.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5380000 16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 OCS J = 19 − 18 231.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0609934 110.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9 N2D+ J = 3 − 2 231.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3218283 22.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 13CS J = 5 − 4 231.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2206852 33.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3 C2S JN = 1918 − 1817 233.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9384580 109.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 PN J = 5 − 4 234.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9356940 33.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 HC3N J = 26 − 25 236.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5127888 153.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 H2CS JKaKc = 717 − 616 236.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7270204 58.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 B.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' CHANNEL MAPS Channel maps of the primary line targets (listed in Table 1) are presented in Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' C.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' AUXILIARY LINE TARGETS Table 3 lists the beam sizes, per-channel rms of the image cubes, and 3σ flux upper limits for the auxiliary line targets.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The flux upper limits were estimated as- suming the same velocity range and aperture used to measure the C18O flux (see Table 1).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Flux upper lim- its may be underestimated if the molecule is primarily present in the envelope or outflow rather than the disk.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' REFERENCES Akiyama, E.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Vorobyov, E.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} 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'/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 8 4 0 4 8 [′′] 8 4 0 4 8 [′′] 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 50 100 250 500 700 12CO J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 12CO J = 2 �� 1 toward DR Tau, part 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The top right of each panel is labelled with the LSRK velocity (km s−1).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The synthesized beam is drawn in the lower left corner of each panel.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The purple crosses denote the disk center.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Offsets from the disk center (in arcseconds) are marked on the axes in the lower left corner.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' The color scale uses an arcsinh stretch to make faint extended features more visible.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Molecular Mapping of DR Tau 19 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 4.' metadata={'source': 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metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 50 100 250 500 700 12CO J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 12CO J = 2 − 1 toward DR Tau, part 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 20 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 8 4 0 4 8 [′′] 8 4 0 4 8 [′′] 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 12.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 50 100 250 500 700 12CO J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 12CO J = 2 − 1 toward DR Tau, part 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Andrews, S.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' M.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Huang, J.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', P´erez, L.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' M.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2018, ApJL, 869, L41, doi: 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3847/2041-8213/aaf741 Ardila, D.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' R.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Basri, G.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Walter, F.' metadata={'source': 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Artur de la Villarmois, E.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Guzm´an, V.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' V.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Jørgensen, J.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' K.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2022, A&A, 667, A20, doi: 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1051/0004-6361/202244312 Arulanantham, N.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', France, K.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Cazzoletti, P.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020, AJ, 159, 168, doi: 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3847/1538-3881/ab789a Molecular Mapping of DR Tau 21 13.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 13.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 13.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 13.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 13.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 14.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 14.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 14.' metadata={'source': 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metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 50 100 250 500 700 12CO J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 12CO J = 2 − 1 toward DR Tau, part 4.' metadata={'source': 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'/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 8 4 0 4 8 [′′] 8 4 0 4 8 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 0 50 100 200 300 13CO J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of 13CO J = 2 − 1 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Banzatti, A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Meyer, M.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' R.' metadata={'source': 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'/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 50 100 150 200 C18O J = 2 1 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of C18O J = 2 − 1 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 5, 10, 15, 20, 30σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 15 30 45 60 SO JN = 65 54 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of SO JN = 65 − 54 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 5, 10σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 24 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 15 30 45 SO JN = 55 44 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of SO JN = 55 − 44 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 5σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 9 18 27 36 DCO + J = 3 2 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of DCO+ J = 3 − 2 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 5σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Molecular Mapping of DR Tau 25 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 25 50 75 100 H2CO JKaKc = 303 202 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of H2CO JKaKc = 303 −202 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 5, 10, 15σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 10 20 30 H2CO JKaKc = 322 221 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of H2CO JKaKc = 322 − 221 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3, 4σ levels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 26 Huang et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 2 0 2 [′′] 2 0 2 [′′] 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0 200 au 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8 0 5 10 15 20 25 H2CO JKaKc = 321 220 intensity (mJy beam 1) Figure 10.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='9.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Channel maps of H2CO JKaKc = 321 − 220 toward DR Tau.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Contours are drawn in pink at the 3σ level.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Table 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Imaging Summary for Auxiliary Line Targets Transition Synthesized beam Per-channel RMS noisea 3σ Flux Upper Limit (arcsec × arcsec (◦)) (mJy beam−1) (mJy km s−1) 13C17O J = 2 − 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (18.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0◦) 8 < 40 H2S JKaKc = 220 − 211 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6◦) 7 < 40 c-C3H2 JKaKc = 330 − 221 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7◦) 7 < 30 SiO J = 5 − 4 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='4◦) 7 < 30 DCN J = 3 − 2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='5◦) 7 < 40 c-C3H2 JKaKc = 514 − 423 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='21 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='93 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7◦) 7 < 30 HC3N J = 24 − 23 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='20 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='94 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='0◦) 7 < 30 OCS J = 19 − 18 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='18 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='91 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3◦) 7 < 30 N2D+ J = 3 − 2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='18 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='91 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3◦) 10 < 70 13CS J = 5 − 4 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='18 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='91 (17.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='3◦) 8 < 50 C2S JN = 1918 − 1817 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='17 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='90 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6◦) 10 < 50 PN J = 5 − 4 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='17 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='90 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='8◦) 9 < 40 HC3N J = 26 − 25 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='17 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='90 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='7◦) 10 < 50 H2CS JKaKc = 717 − 616 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='17 × 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='90 (16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='6◦) 11 < 80 aFor channel widths of 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content='2 km s−1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' Molecular Mapping of DR Tau 27 Cuello, N.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Louvet, F.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', Mentiplay, D.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=', et al.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/KtE0T4oBgHgl3EQfzgKz/content/2301.02674v1.pdf'} +page_content=' 2020, MNRAS, 491, 504, doi: 10.' metadata={'source': 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