Qatar-2: A K Dwarf Orbited by a Transiting Hot Jupiter and a More Massive Companion in an Outer Orbit

May 2012 • 2012ApJ...750...84B

Authors • 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. • Buchhave, Lars A. • Calkins, Michael L. • Esquerdo, Gilbert A. • Fűrész, Gábor • Gråe Jørgensen, Uffe • Horne, Keith D. • Stefanik, Robert P. • Street, Rachel A. • Torres, Guillermo • West, Richard G. • Dominik, Martin • Harpsøe, Kennet B. W. • Liebig, Christine • Calchi Novati, Sebastiano • Ricci, Davide • Skottfelt, Jesper F.

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.

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Sebastiano Calchi Novati

Associate Scientist

Benjamin Fulton

Assistant Scientist