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Primordial or Secon...
Primordial or Secondary? Testing Models of Debris Disk Gas with ALMA*
- Article/chapterEnglish2023
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LIBRIS-ID:oai:DiVA.org:su-221365
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-221365URI
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https://doi.org/10.3847/1538-4357/acd6f3DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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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.
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Aikawa, Yuri
(author)
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Iwasaki, Kazunari
(author)
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Marino, Sebastian
(author)
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Brandeker, Alexis,1974-Stockholms universitet,Institutionen för astronomi(Swepub:su)alexis
(author)
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Hales, Antonio
(author)
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Henning, Thomas
(author)
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Higuchi, Aya E.
(author)
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Hughes, A. Meredith
(author)
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Janson, Markus,1981-Stockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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Kral, Quentin
(author)
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Matra, Luca
(author)
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Moor, Attila
(author)
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Olofsson, Göran,1944-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)olofsson
(author)
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Redfield, Seth
(author)
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Roberge, Aki
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astrophysical Journal951:20004-637X1538-4357
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Cataldi, Gianni
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Aikawa, Yuri
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Iwasaki, Kazunar ...
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Marino, Sebastia ...
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Brandeker, Alexi ...
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Hales, Antonio
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Henning, Thomas
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Higuchi, Aya E.
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Hughes, A. Mered ...
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Janson, Markus, ...
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Kral, Quentin
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Matra, Luca
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Moor, Attila
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Olofsson, Göran, ...
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Redfield, Seth
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Roberge, Aki
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University