Qatar-2 : a K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit
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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.
Bryan , M L , Alsubai , K A , Latham , D W , Parley , N R , Cameron , A C , Quinn , S N , Carter , J A , Fulton , B J , Berlind , P , Brown , W R , Buchhave , L A , Calkins , M L , Esquerdo , G A , Furesz , G , Jorgensen , U G , Horne , K D , Stefanik , R P , Street , R A , Torres , G , West , R G , Dominik , M , Harpsoe , K B W , Liebig , C , Calchi Novati , S , Ricci , D & Skottfelt , J F 2012 , ' Qatar-2 : a K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit ' Astrophysical Journal , vol 750 , no. 1 , 84 . DOI: 10.1088/0004-637X/750/1/84
© 2012. The American Astronomical Society. All rights reserved.
G.F. acknowledges financial support from the Hungarian OTKA-NFU Mobility grant MB08C 81013. C.L. acknowledges the Qatar Foundation for support from QNRF grant NPRP-09-476-1-078. D.R. (boursier FRIA) acknowledges support from the Communauté française de Belgique—Actions de recherche concertées—Académie universitaire Wallonie-Europe.