%AAlarcón, Felipe%ABosman, Arthur%ABergin, Edwin%AZhang, Ke%ATeague, Richard%ABae, Jaehan%AAikawa, Yuri%AAndrews, Sean%ABooth, Alice%ACalahan, Jenny%ACataldi, Gianni%ACzekala, Ian%AHuang, Jane%AIlee, John%ALaw, Charles%ALe Gal, Romane%ALiu, Yao%ALong, Feng%ALoomis, Ryan%AMénard, François%AÖberg, Karin%ASchwarz, Kamber%Avan ’t Hoff, Merel%AWalsh, Catherine%AWilner, David%BJournal Name: The Astrophysical Journal Supplement Series; Journal Volume: 257; Journal Issue: 1 %D2021%I %JJournal Name: The Astrophysical Journal Supplement Series; Journal Volume: 257; Journal Issue: 1 %K %MOSTI ID: 10355530 %PMedium: X %TMolecules with ALMA at Planet-forming Scales (MAPS). VIII. CO Gap in AS 209—Gas Depletion or Chemical Processing? %X %0Journal Article