2013ApJ...773...64P

We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with a mass of 1.477_–0.067^+0.066M_J, radius of 1.345±0.072 R_J, and an orbital period of 2.7033904±0.000010 days. The host star, KELT-3, is a V = 9.8 late F star with M_* = 1.278_–0.061^+0.063M_☉, R_* = 1.472_0.067^+0.065R_☉, T_eff = 6306_–49⁺⁵⁰ K, log(g) = 4.209_–0.031^+0.033, and [Fe/H] = 0.044_–0.082^+0.065, and has a likely proper motion companion. KELT-3b is the third transiting exoplanet discovered by the KELT survey, and is orbiting one of the 20 brightest known transiting planet host stars, making it a promising candidate for detailed characterization studies. Although we infer that KELT-3 is significantly evolved, a preliminary analysis of the stellar and orbital evolution of the system suggests that the planet has likely always received a level of incident flux above the empirically identified threshold for radius inflation suggested by Demory & Seager.