TrES5: A Massive Jupitersized Planet Transiting a Cool G Dwarf
Abstract
We report the discovery of TrES5, a massive hot Jupiter that transits the star GSC 0394900967 every 1.48 days. From spectroscopy of the star we estimate a stellar effective temperature of T _{eff} = 5171 ± 36 K, and from highprecision B, R, and I photometry of the transit we constrain the ratio of the semimajor axis a and the stellar radius R _{sstarf} to be a/R _{sstarf} = 6.07 ± 0.14. We compare these values to model stellar isochrones to obtain a stellar mass of M _{sstarf} = 0.893 ± 0.024 M _{⊙}. Based on this estimate and the photometric time series, we constrain the stellar radius to be R _{sstarf} = 0.866 ± 0.013 R _{⊙} and the planet radius to be R _{p} = 1.209 ± 0.021 R _{J}. We model our radialvelocity data assuming a circular orbit and find a planetary mass of 1.778 ± 0.063 M _{J}. Our radialvelocity observations rule out linebisector variations that would indicate a specious detection resulting from a blend of an eclipsing binary system. TrES5 orbits one of the faintest stars with transiting planets found to date from the ground and demonstrates that precise photometry and followup spectroscopy are possible, albeit challenging, even for such faint stars.
 Publication:

The Astrophysical Journal
 Pub Date:
 November 2011
 DOI:
 10.1088/0004637X/741/2/114
 arXiv:
 arXiv:1108.3572
 Bibcode:
 2011ApJ...741..114M
 Keywords:

 planetary systems;
 techniques: photometric;
 techniques: radial velocities;
 techniques: spectroscopic;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 doi:10.1088/0004637X/741/2/114