An Unbiased ALMA Spectral Survey of the LkCa 15 and MWC 480 Protoplanetary Disks - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2020

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

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1
Ryan A. Loomis
  • Function : Author
Karin I. Öberg
  • Function : Author
Sean M. Andrews
  • Function : Author
Edwin Bergin
  • Function : Author
Jennifer Bergner
  • Function : Author
Geoffrey A. Blake
  • Function : Author
L. Ilsedore Cleeves
  • Function : Author
Ian Czekala
  • Function : Author
Jane Huang
  • Function : Author
Romane Le Gal
  • Function : Author
Jamila Pegues
  • Function : Author
Chunhua Qi
  • Function : Author
Catherine Walsh
  • Function : Author
Jonathan P. Williams
  • Function : Author
David J. Wilner
  • Function : Author

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.

Dates and versions

insu-03705215 , version 1 (27-06-2022)

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Ryan A. Loomis, Karin I. Öberg, Sean M. Andrews, Edwin Bergin, Jennifer Bergner, et al.. An Unbiased ALMA Spectral Survey of the LkCa 15 and MWC 480 Protoplanetary Disks. The Astrophysical Journal, 2020, 893, ⟨10.3847/1538-4357/ab7cc8⟩. ⟨insu-03705215⟩
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