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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 3.

C/O ratio for our models with radial changes in the amount of C. The C/O starts at 1, then it reaches a value of 2 in the gas gap where extra atomic carbon is added. In this region most of the carbon grain destruction would occur. It also coincides with the region where the C₂H column density reaches its highest values. Beyond 100 au we added extra water ice to decrease the C/O ratio toward an ISM value C/O = 0.4.

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