Paper

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

Novati, Sebastiano Calchi, Ricci, Davide, Furesz, Gabor, Jorgensen, Uffe Grae, Skottfelt, Jesper F, Horne, Keith D, Street, Rachel A, Liebig, Christine, Berlind, Perry, Martin, Dominik, Calkins, Michael L, Stefanik, Robert P, Alsubai, Khalid A, Andrew Collier Cameron, Brown, Warren R, West, Richard G, Latham, David W, Quinn, Samuel N, Fulton, Benjamin J, Esquerdo, Gilbert A, Parley, Neil R, Buchhave, Lars A, Kennet B W Harpsoe, Carter, Joshua A, Bryan, Marta L, Torres, Guillermo

2011

Overview

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.

• Publisher: Cornell University Library, arXiv.org
• Subject: Circular orbits / Computer architecture / Extrasolar planets / Gas giant planets / Neptune / Orbits