ALMA MEASUREMENTS of CIRCUMSTELLAR MATERIAL in the GQ LUP SYSTEM

Meredith A. Macgregor, David J. Wilner, Ian Czekala, Sean M. Andrews, Y. Sophia Dai, Gregory J. Herczeg, Kaitlin M. Kratter, Adam L. Kraus, Luca Ricci, Leonardo Testi

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

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) (d/156 pc) M o, where d is a known distance, and determine that we view the disk at an inclination angle of 60.°5 ±0.°5 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 <0.15 mJy implies an upper limit on the dust disk mass of <0.04 M 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.

Original languageEnglish (US)
Article number17
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
StatePublished - Jan 20 2017

Keywords

  • circumstellar matter
  • stars: individual (GQ Lup)
  • submillimeter: planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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