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 mag 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 M p = 8.40 +0.35 − 0.34 M J and a radius of R p = 1.136 +0.073 − 0.054 R J , yielding a mean density of ρ p = 7.1 ± 1.1 g cm −3 .
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Buchhave et al. (2011) studied this question.
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