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Debris Disks in the Scorpius–Centaurus OB Association Resolved by ALMA

Lieman-Sifry, Jesse and Hughes, A. Meredith and Carpenter, John M. and Gorti, Uma and Hales, Antonio and Flaherty, Kevin M. (2016) Debris Disks in the Scorpius–Centaurus OB Association Resolved by ALMA. Astrophysical Journal, 828 (1). Art. No. 25. ISSN 0004-637X. doi:10.3847/0004-637X/828/1/25.

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We present a CO(2-1) and 1240 μm continuum survey of 23 debris disks with spectral types B9-G1, observed at an angular resolution of 0.”5–1'' with the Atacama Large Millimeter/Submillimeter Array (ALMA). The sample was selected for large infrared excess and age ~10 Myr, to characterize the prevalence of molecular gas emission in young debris disks. We identify three CO-rich debris disks, plus two additional tentative (3σ) CO detections. Twenty disks were detected in the continuum at the >3σ level. For the 12 disks in the sample that are spatially resolved by our observations, we perform an independent analysis of the interferometric continuum visibilities to constrain the basic dust disk geometry, as well as a simultaneous analysis of the visibilities and broadband spectral energy distribution to constrain the characteristic grain size and disk mass. The gas-rich debris disks exhibit preferentially larger outer radii in their dust disks, and a higher prevalence of characteristic grain sizes smaller than the blowout size. The gas-rich disks do not exhibit preferentially larger dust masses, contrary to expectations for a scenario in which a higher cometary destruction rate would be expected to result in a larger mass of both CO and dust. The three debris disks in our sample with strong CO detections are all around A stars: the conditions in disks around intermediate-mass stars appear to be the most conducive to the survival or formation of CO.

Item Type:Article
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URLURL TypeDescription Paper
Carpenter, John M.0000-0003-2251-0602
Additional Information:© 2016 The American Astronomical Society. Received 2016 February 11; revised 2016 June 20; accepted 2016 June 20; published 2016 August 25.
Group:Space Solar Power Project
Funding AgencyGrant Number
Subject Keywords:circumstellar matter – planetary systems – planets and satellites: formation – protoplanetary disks – submillimeter: planetary systems
Issue or Number:1
Record Number:CaltechAUTHORS:20160829-081410451
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Official Citation:Jesse Lieman-Sifry et al 2016 ApJ 828 25
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69981
Deposited By: Tony Diaz
Deposited On:29 Aug 2016 17:32
Last Modified:11 Nov 2021 04:22

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