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An Unbiased ALMA Spectral Survey of the LkCa 15 and MWC 480 Protoplanetary Disks

Loomis, Ryan A. and Öberg, Karin I. and Andrews, Sean M. and Bergin, Edwin and Bergner, Jennifer and Blake, Geoffrey A. and Cleeves, L. Ilsedore and Czekala, Ian and Huang, Jane and Le Gal, Romane and Ménard, François and Pegues, Jamila and Qi, Chunhua and Walsh, Catherine and Williams, Jonathan P. and Wilner, David J. (2020) An Unbiased ALMA Spectral Survey of the LkCa 15 and MWC 480 Protoplanetary Disks. Astrophysical Journal, 893 (2). Art. No. 101. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20200420-140631555

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Abstract

The volatile contents of protoplanetary disks both set the potential for planetary chemistry and provide valuable probes of defining disk system characteristics such as stellar mass, gas mass, ionization, and temperature structure. Current disk molecular inventories are fragmented, however, giving an incomplete picture: unbiased spectral line surveys are needed to assess the volatile content. We present here an overview of such a survey of the protoplanetary disks around the Herbig Ae star MWC 480 and the T Tauri star LkCa 15 in ALMA Band 7, spanning ~36 GHz from 275 to 317 GHz and representing an order of magnitude increase in sensitivity over previous single-dish surveys. We detect 14 molecular species (including isotopologues), with five species (C³⁴S, ¹³CS, H₂CS, DNC, and C₂D) detected for the first time in protoplanetary disks. Significant differences are observed in the molecular inventories of MWC 480 and LkCa 15, and we discuss how these results may be interpreted in light of the different physical conditions of these two disk systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab7cc8DOIArticle
https://arxiv.org/abs/2006.16187arXivDiscussion Paper
ORCID:
AuthorORCID
Loomis, Ryan A.0000-0002-8932-1219
Öberg, Karin I.0000-0001-8798-1347
Andrews, Sean M.0000-0003-2253-2270
Bergin, Edwin0000-0003-4179-6394
Bergner, Jennifer0000-0002-8716-0482
Blake, Geoffrey A.0000-0003-0787-1610
Cleeves, L. Ilsedore0000-0003-2076-8001
Czekala, Ian0000-0002-1483-8811
Huang, Jane0000-0001-6947-6072
Le Gal, Romane0000-0003-1837-3772
Ménard, François0000-0002-1637-7393
Pegues, Jamila0000-0002-6042-1486
Qi, Chunhua0000-0001-8642-1786
Walsh, Catherine0000-0001-6078-786X
Williams, Jonathan P.0000-0001-5058-695X
Wilner, David J.0000-0003-1526-7587
Additional Information:© 2020 The American Astronomical Society. Received 2019 May 30; revised 2020 February 27; accepted 2020 March 3; published 2020 April 20. R.A.L. gratefully acknowledges funding from ALMA Student Observing Support and a Jansky Fellowship. K.I.O. acknowledges funding from the David and Lucile Packard Foundation and from the Simons Foundation (SCOL #321183). J.H. acknowledges support from the National Science Foundation Graduate Research Fellowship under grant No. DGE-1144152. E.A.B. acknowledges funding through NSF grant AST-1514670 and NASA NNX16AB48G. C.W. acknowledges financial support from STFC (grant reference ST/R000549/1) and the University of Leeds. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00226.S and ADS/JAO.ALMA#2015.1.00657.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
ALMA Student Observing SupportUNSPECIFIED
National Radio Astronomy ObservatoryUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Simons Foundation321183
NSF Graduate Research FellowshipDGE-1144152
NSFAST-1514670
NASANNX16AB48G
Science and Technology Facilities Council (STFC)ST/R000549/1
University of LeedsUNSPECIFIED
Subject Keywords:Protoplanetary disks ; Astrochemistry
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Protoplanetary disks (1300); Astrochemistry (75)
Record Number:CaltechAUTHORS:20200420-140631555
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200420-140631555
Official Citation:Ryan A. Loomis et al 2020 ApJ 893 101
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102666
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Apr 2020 21:17
Last Modified:14 Jul 2020 19:50

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