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Molecules with ALMA at Planet-forming Scales (MAPS). VIII. CO Gap in AS 209—Gas Depletion or Chemical Processing?

  • Authors: Felipe Alarcón, Arthur D. Bosman, Edwin A. Bergin, Ke Zhang, Richard Teague, Jaehan Bae, Yuri Aikawa, Sean M. Andrews, Alice S. Booth, Jenny K. Calahan, Gianni Cataldi, Ian Czekala, Jane Huang, John D. Ilee, Charles J. Law, Romane Le Gal, Yao Liu, Feng Long, Ryan A. Loomis, François Ménard, Karin I. Öberg, Kamber R. Schwarz, Merel L. R. van 't Hoff, Catherine Walsh, David J. Wilner

Felipe Alarcón et al 2021 The Astrophysical Journal Supplement Series 257 .

  • Provider: AAS Journals

Caption: Figure 11.

C2H and C18O radial profile for the velocity-integrated emission lines in ALMA Band 6, while the gray line displays the continuum-emission profile from DSHARP (Andrews et al. 2018; Guzmán et al. 2018) on the left and from MAPS (Öberg et al. 2021) on the right. We observe that C18O shows a wide gap before showing a second peak after the outer ring at 120 au. C2H shows an inverse correlation to C18O, peaking at the location of the C18O gap, making AS 209 a unique source for the study of CO chemical processing among the sources in the MAPS survey.

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