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

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

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18 Citations (Scopus)


We report the discovery and initial characterization of Qatar-2b, a hot Jupiter transiting a V = 13.3mag 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.

Original languageEnglish
Article number84
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 1 May 2012



  • planetary systems
  • stars: individual (Qatar-2)
  • techniques: photometric
  • techniques: radial velocities
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Bryan, M. L., Al-Subai, K., Latham, D. W., Parley, N. R., Collier Cameron, A., Quinn, S. N., Carter, J. A., Fulton, B. J., Berlind, P., Brown, W. R., Buchhave, L. A., Calkins, M. L., Esquerdo, G. A., Frész, G., Jorgensen, U. G., Horne, K. D., Stefanik, R. P., Street, R. A., Torres, G., ... 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, 750(1), [84].