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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 12.

Comparison between the inferred CO column densities from Zhang et al. (2021) and a model using the gas surface density from the hydrodynamic simulations in DSHARP (Zhang et al. 2018). The gas surface-density profile was scaled to the disk mass used in our simulations and with the same abundances listed in Table 2 without any extra CO depletion. The profile using the the DSHARP gas surface density overestimates the CO column density by an order of magnitude, and the location of the dips and peaks do not match the ones observed in CO, supporting the CO-processing solution.

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