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American Astronomical Society, Astrophysical Journal, 1(835), p. 17

DOI: 10.3847/1538-4357/835/1/17

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Alma measurements of circumstellar material in the GQ Lup system

Journal article published in 2017 by Meredith A. MacGregor ORCID, David J. Wilner ORCID, Sean M. Andrews ORCID, Ian Czekala ORCID, Yu Sophia Dai ORCID, Gregory J. Herczeg ORCID, Kaitlin M. Kratter ORCID, Adam L. Kraus ORCID, Luca Ricci, Leonardo Testi ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 μm continuum and CO J = 3–2 line emission with beam size ~0"3 (~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) lowast (d/156 pc) M_⊙, where d is a known distance, and determine that we view the disk at an inclination angle of 60º5 ± 0º5 and a position angle of 346° ± 1°. The 3σ upper limit on the 870 μm flux density of any circumplanetary disk associated with GQ Lup b of