TrES-2: The first transiting planet in the Kepler field

Francis T. O'Donovan, David Charbonneau, Georgi Mandushev, Edward W. Dunham, David W. Latham, Guillermo Torres, Alessandro Sozzetti, Timothy M. Brown, John T. Trauger, Juan A. Belmonte, Markus Rabus, José M. Almenara, Roi Alonso, Hans J. Deeg, Gilbert A. Esquerdo, Emilio E. Falco, Lynne A. Hillenbrand, Anna Roussanova, Robert P. Stefanik, Joshua N. Winn

Research output: Contribution to journalArticlepeer-review

154 Scopus citations


We announce the discovery of the second transiting hot Jupiter discovered by the Trans-atlantic Exoplanet Survey. The planet, which we dub TrES-2, orbits the nearby star GSC 03549-02811 every 2.47063 days. From high-resolution spectra, we determine that the star has Teff = 5960 ± 100 K and log g = 4.4 ± 0.2, implying a spectral type of G0 V and a mass of 1.08-0.05+0.11 M. High-precision radial velocity measurements confirm a sinusoidal variation with the period and phase predicted by the photometry, and rule out the presence of line bisector variations that would indicate that the spectroscopic orbit is spurious. We estimate a planetary mass of 1.28-0.04+0.09 M Jup. We model B, r, R, and I photometric time series of the 1.4% deep transits and find a planetary radius of 1.24-0.06+0.09 RJup. This planet lies within the field of view of the NASA Kepler mission, ensuring that hundreds of upcoming transits will be monitored with exquisite precision and permitting a host of unprecedented investigations.

Original languageEnglish (US)
Pages (from-to)L61-L64
JournalAstrophysical Journal
Issue number1 II
StatePublished - Nov 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Stars: individual (GSC 03549-02811)
  • Techniques: photometric
  • Techniques: radial velocities


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