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., Furész, 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 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, 750 84. https://doi.org/10.1088/0004-637X/750/1/84.
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.
