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American Astronomical Society, Astrophysical Journal, 1(750), p. 84, 2012

DOI: 10.1088/0004-637x/750/1/84

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

Journal article published in 2011 by Marta L. Bryan, Khalid A. Alsubai, David W. Latham, Neil R. Parley, Andrew Collier Cameron, Andrew Collier Cameron, Samuel N. Quinn, Joshua A. Carter, Benjamin J. Fulton, Perry Berlind, Warren R. Brown, Lars A. Buchhave ORCID, Michael L. Calkins, Gilbert A. Esquerdo, Gabor Furesz and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.