TrES-4: A Transiting Hot Jupiter of Very Low Density

  title={TrES-4: A Transiting Hot Jupiter of Very Low Density},
  author={Georgi I. Mandushev and Francis T. O'Donovan and David Charbonneau and Guillermo Torres and David W. Latham and G{\'a}sp{\'a}r {\'A}. Bakos and Edward Wood Dunham and Alessandro Sozzetti and Jos'e Miguel Fern'andez and Gilbert A. Esquerdo and Mark E. Everett and Timothy M. Brown and Markus Rabus and Juan Antonio Taguenca Belmonte and L. A. Hillenbrand},
  journal={The Astrophysical Journal Letters},
  pages={L195 - L198}
We report the discovery of TrES-4, a hot Jupiter that transits the star GSC 02620-00648 every 3.55 days. From high-resolution spectroscopy of the star, we estimate a stellar effective temperature of Teff = 6100 ± 150 K, and from high-precision z and B photometry of the transit we constrain the ratio of the semimajor axis a and the stellar radius R* to be a/R* = 6.03 ± 0.13. We compare these values to model stellar isochrones to constrain the stellar mass to be M* = 1.22 ± 0.17 M☉. Based on this… 

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