QATAR-2: A K DWARF ORBITED BY A TRANSITING HOT JUPITER AND A MORE MASSIVE COMPANION IN AN OUTER ORBIT

Journal Article · Tue May 01 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/750/1/84· OSTI ID:22034566

Bryan, Marta L ^[1]; Alsubai, Khalid A ^[2]; Latham, David W; Quinn, Samuel N; Carter, Joshua A; Berlind, Perry; Brown, Warren R; Calkins, Michael L; Esquerdo, Gilbert A; Furesz, Gabor; Stefanik, Robert P; Torres, Guillermo ^[3]; Parley, Neil R; Collier Cameron, Andrew; Horne, Keith D ^[4]; Fulton, Benjamin J; Street, Rachel A ^[5]; Buchhave, Lars A; Jorgensen, Uffe Grae ^[6]; West, Richard G ^[7] ; others, and

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1. Department of Astronomy, Harvard University, Cambridge, MA 02138 (United States)
2. Qatar Foundation, P.O. Box 5825, Doha (Qatar)
3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
4. SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS (United Kingdom)
5. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA 93117 (United States)
6. Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100 Copenhagen (Denmark)
7. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom)

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{sub b} = 1.34 days. The mass and radius of Qatar-2b are M{sub P} = 2.49 M{sub J} and R{sub P} = 1.14 R{sub 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{sub 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.

• OSTI ID: 22034566
• Journal Information: Astrophysical Journal, Vol. 750, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
DWARF STARS
MASS
ORBITS
PLANETS
RADIAL VELOCITY