We present the discovery of a hot Jupiter transiting an F star in a close visual (0.3" sky projected angular separation) binary system. The dilution of the host star's light by the nearly equal magnitude stellar companion (~ 0.5 magnitudes fainter) significantly affects the derived planetary parameters, and if left uncorrected, leads to an underestimate of the radius and mass of the planet by 10% and 60%, respectively. Other published exoplanets, which have not been observed with high-resolution imaging, could similarly have unresolved stellar companions and thus have incorrectly derived planetary parameters. Kepler-14b (KOI-98) has a period of P = 6.790 days and correcting for the dilution, has a mass of Mp = 8.40 +0.19-0.18 MJ and a radius of Rp = 1.136 +0.073-0.054 RJ, yielding a mean density of rho = 7.1 +- 1.1 g cm-3.
@article{arxiv.1106.5510,
title = {Kepler-14b: A massive hot Jupiter transiting an F star in a close visual binary},
author = {Lars A. Buchhave and David W. Latham and Joshua A. Carter and Jean-Michel Désert and Guillermo Torres and Elisabeth R. Adams and Stephen T. Bryson and David B. Charbonneau and David R. Ciardi and Craig Kulesa and Andrea K. Dupree and Debra A. Fischer and François Fressin and Thomas N. Gautier and Ronald L. Gilliland and Steve B. Howel and Howard Isaacson and Jon M. Jenkins and Geoffrey W. Marcy and Donald W. McCarthy and Jason F. Rowe and Natalie M. Batalha and William J. Borucki and Timothy M. Brown and Douglas A. Caldwell and Jessie L. Christiansen and William D. Cochran and Drake Deming and Edward W. Dunham and Mark Everett and Eric B. Ford and Jonathan J. Fortney and John C. Geary and Forrest R. Girouard and Michael R. Haas and Matthew J. Holman and Elliott Horch and Todd C. Klaus and Heather A. Knutson and David G. Koch and Jeffrey Kolodziejczak and Jack J. Lissauer and Pavel Machalek and Fergal Mullally and Martin D. Still and Samuel N. Quinn and Sara Seager and Susan E. Thompson and Jeffrey Van Cleve},
journal= {arXiv preprint arXiv:1106.5510},
year = {2015}
}