Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modelling the Spatial Distribution and Origin of CO Gas in Debris Disks   The detection of gas in debris disks raises the question of whether this gas
is a remnant from the primordial protoplanetary phase, or released by the
collision of secondary bodies. In this paper we analyze ALMA observations at
1-1.5" resolution of three debris disks where the $^{12}$CO(2-1) rotational
line was detected: HD131835, HD138813, and HD156623. We apply the iterative
Lucy-Richardson deconvolution technique to the problem of circumstellar disks
to derive disk geometries and surface brightness distributions of the gas. The
derived disk parameters are used as input for thermochemical models to test
both primordial and cometary scenarios for the origin of the gas. We favor a
secondary origin for the gas in these disks and find that the CO gas masses
($\sim 3\times10^{-3}$ M$_{\oplus}$) require production rates ($\sim 5\times
10^{-7}$ M$_{\oplus}$~yr$^{-1}$) similar to those estimated for the bona-fide
gas rich debris disk $\beta$ Pic.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg