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QATAR-2 : a K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit

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Bryan, Marta L., Alsubai, Khalid A., Latham, David W., Parley, Neil R., Collier Cameron, Andrew, Quinn, Samuel N., Carter, Joshua A., Fulton, Benjamin J., Berlind, Perry, Brown, Warren R. et al.
(2012) QATAR-2 : a K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit. The Astrophysical Journal, Volume 750 (Number 1). Article number 84. doi:10.1088/0004-637X/750/1/84

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Official URL: http://dx.doi.org/10.1088/0004-637X/750/1/84

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Abstract

We report the discovery and initial characterization of Qatar-2b, a hot Jupiter transiting a V = 13.3 mag K dwarf in a circular orbit with a short period, P b = 1.34 days. The mass and radius of Qatar-2b are M P = 2.49 M J and R P = 1.14 R J, respectively. Radial-velocity monitoring of Qatar-2 over a span of 153 days revealed the presence of a second companion in an outer orbit. The Systemic Console yielded plausible orbits for the outer companion, with periods on the order of a year and a companion mass of at least several M J. Thus, Qatar-2 joins the short but growing list of systems with a transiting hot Jupiter and an outer companion with a much longer period. This system architecture is in sharp contrast to that found by Kepler for multi-transiting systems, which are dominated by objects smaller than Neptune, usually with tightly spaced orbits that must be nearly coplanar.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 1 May 2012
Dates:
DateEvent
1 May 2012Published
Volume: Volume 750
Number: Number 1
Article Number: Article number 84
DOI: 10.1088/0004-637X/750/1/84
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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