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Primordial or Secondary? Testing Models of Debris Disk Gas with ALMA*
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Rekke forfattare: 162023 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 951, nr 2, artikkel-id 111Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The origin and evolution of gas in debris disks are still not well understood. Secondary gas production from cometary material or a primordial origin have been proposed. So far, observations have mostly concentrated on CO, with only a few C observations available. We overview the C and CO content of debris disk gas and test state-of-the-art models. We use new and archival Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO and C i emission, complemented by C ii data from Herschel, for a sample of 14 debris disks. This expands the number of disks with ALMA measurements of both CO and C i by 10 disks. We present new detections of C i emission toward three disks: HD 21997, HD 121191, and HD 121617. We use a simple disk model to derive gas masses and column densities. We find that current state-of-the-art models of secondary gas production overpredict the C-0 content of debris disk gas. This does not rule out a secondary origin, but might indicate that the models require an additional C removal process. Alternatively, the gas might be produced in transient events rather than a steady-state collisional cascade. We also test a primordial gas origin by comparing our results to a simplified thermochemical model. This yields promising results, but more detailed work is required before a conclusion can be reached. Our work demonstrates that the combination of C and CO data is a powerful tool to advance our understanding of debris disk gas.

sted, utgiver, år, opplag, sider
2023. Vol. 951, nr 2, artikkel-id 111
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URN: urn:nbn:se:su:diva-221365DOI: 10.3847/1538-4357/acd6f3ISI: 001023848400001Scopus ID: 2-s2.0-85165171827OAI: oai:DiVA.org:su-221365DiVA, id: diva2:1798586
Tilgjengelig fra: 2023-09-19 Laget: 2023-09-19 Sist oppdatert: 2023-09-19bibliografisk kontrollert

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Brandeker, AlexisJanson, MarkusOlofsson, Göran

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Iwasaki, KazunariBrandeker, AlexisHales, AntonioHiguchi, Aya E.Janson, MarkusMatra, LucaOlofsson, Göran
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