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

Marta L. Bryan*, Khalid A. Alsubai, 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, Gabor Furesz, Uffe Grae 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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.

Original languageEnglish
Article number84
Number of pages11
JournalAstrophysical Journal
Issue number1
Early online date17 Apr 2012
Publication statusPublished - May 2012


  • Planetary systems
  • Stars: individual (Qatar-2)
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic
  • Proper-motion stars
  • Light curves
  • Planet
  • Algorithm
  • Candidates
  • Parameters
  • Atmosphere
  • Spectrum
  • Systems
  • Search


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