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The Surprisingly Low Carbon Mass in the Debris Disk around HD 32297

Cataldi, Gianni (author)
Wu, Yanqin (author)
Brandeker, Alexis (author)
Stockholms universitet,Institutionen för astronomi
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Ohashi, Nagayoshi (author)
Moór, Attila (author)
Olofsson, Göran (author)
Stockholms universitet,Institutionen för astronomi
Ábrahám, Péter (author)
Asensio-Torres, Ruben (author)
Stockholms universitet,Institutionen för astronomi
Cavallius, Maria (author)
Stockholms universitet,Institutionen för astronomi
Dent, William R. F. (author)
Grady, Carol (author)
Henning, Thomas (author)
Higuchi, Aya E. (author)
Hughes, A. Meredith (author)
Janson, Markus (author)
Stockholms universitet,Institutionen för astronomi
Kamp, Inga (author)
Kóspál, Ágnes (author)
Redfield, Seth (author)
Roberge, Aki (author)
Weinberger, Alycia (author)
Welsh, Barry (author)
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 (creator_code:org_t)
2020-04-02
2020
English.
In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 892:2
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Gas has been detected in a number of debris disks. It is likely secondary, i.e., produced by colliding solids. Here, we report ALMA Band 8 observations of neutral carbon in the CO-rich debris disk around the 15-30 Myr old A-type star HD 32297. We find that C-0 is located in a ring at similar to 110 au with an FWHM of similar to 80 au and has a mass of (3.5 0.2) x 10(-3) M-circle plus. Naively, such a surprisingly small mass can be accumulated from CO photodissociation in a time as short as similar to 10(4) yr. We develop a simple model for gas production and destruction in this system, properly accounting for CO self-shielding and shielding by neutral carbon, and introducing a removal mechanism for carbon gas. We find that the most likely scenario to explain both C-0 and CO observations is one where the carbon gas is rapidly removed on a timescale of order a thousand years and the system maintains a very high CO production rate of similar to 15 M-circle plus Myr(-1), much higher than the rate of dust grind-down. We propose a possible scenario to meet these peculiar conditions: the capture of carbon onto dust grains, followed by rapid CO re-formation and rerelease. In steady state, CO would continuously be recycled, producing a CO-rich gas ring that shows no appreciable spreading over time. This picture might be extended to explain other gas-rich debris disks.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

Exoplanet formation
Submillimeter astronomy
Radio interferometry
Atomic spectroscopy
Debris disks
Circumstellar gas

Publication and Content Type

ref (subject category)
art (subject category)

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