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Author
MacGregor, Meredith A.
Wilner, D.

Czekala, I.

Andrews, S. M.

Dai, Y. Sophia
Herczeg, Gregory J.

Kratter, Kaitlin M.

Kraus, Adam L.

Ricci, Luca
Testi, L.

Affiliation
Univ Arizona, Dept AstronIssue Date
2017-01-16
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IOP PUBLISHING LTDCitation
ALMA MEASUREMENTS OF CIRCUMSTELLAR MATERIAL IN THE GQ LUP SYSTEM 2017, 835 (1):17 The Astrophysical JournalJournal
The Astrophysical JournalRights
© 2017. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present Atacama Large Millimeter/submillimeter Array observations of the GQ Lup system, a young Sun-like star with a substellar-mass companion in a wide-separation orbit. These observations of 870 mu m continuum and CO J = 3-2 line emission with beam size similar to 0."3 (similar to 45 au) resolve the disk of dust and gas surrounding the primary star, GQ Lup A, and provide deep limits on any circumplanetary disk surrounding the companion, GQ Lup b. The circumprimary dust disk is compact with an FWHM of 59 +/- 12 au, while the gas has a larger extent with a characteristic radius of 46.5 +/- 1.8 au. By forward-modeling the velocity field of the circumprimary disk based on the CO emission, we constrain the mass of GQ Lup. A to be M-* = (1.03 +/- 0.05) * (d/156 pc) M-circle dot, where d is a known distance, and determine that we view the disk at an inclination angle of 60 degrees 5 +/- 0 degrees 5 and a position angle of 346 degrees +/- 1 degrees. The 3s upper limit on the 870 mu m flux density of any circumplanetary disk associated with GQ Lup b of <0.15 mJy implies an upper limit on the dust disk mass of <0.04M(circle dot) for standard assumptions about optically thin emission. We discuss proposed mechanisms for the formation of wide-separation substellar companions given the non-detection of circumplanetary disks around GQ Lup b and other similar systems.ISSN
1538-4357Version
Final published versionSponsors
National Science Foundation Graduate Research Fellowship [DGE1144152]; NRAO Student Observing SupportAdditional Links
http://stacks.iop.org/0004-637X/835/i=1/a=17?key=crossref.01ef6673c14afa27fd9da2d99156af18ae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/835/1/17