KELT-3b: A Hot Jupiter Transiting a V = 9.8 Late-F Star

August 2013 • 2013ApJ...773...64P

Authors • Pepper, Joshua • Siverd, Robert J. • Beatty, Thomas G. • Gaudi, B. Scott • Stassun, Keivan G. • Eastman, Jason • Collins, Karen • Latham, David W. • Bieryla, Allyson • Buchhave, Lars A. • Jensen, Eric L. N. • Manner, Mark • Penev, Kaloyan • Crepp, Justin R. • Cargile, Phillip A. • Dhital, Saurav • Calkins, Michael L. • Esquerdo, Gilbert A. • Berlind, Perry • Fulton, Benjamin J. • Street, Rachel • Ma, Bo • Ge, Jian • Wang, Ji • Mao, Qingqing • Richert, Alexander J. W. • Gould, Andrew • DePoy, Darren L. • Kielkopf, John F. • Marshall, Jennifer L. • Pogge, Richard W. • Stefanik, Robert P. • Trueblood, Mark • Trueblood, Patricia

Abstract • We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with a mass of 1.477_{-0.067}^{+0.066} \,M_{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}^{+0.063} \,M_{\odot }, R_* = 1.472_{-0.067}^{+0.065} \,R_{\odot }, T_eff = 6306_{-49}^{+50} K, log (g) = 4.209_{-0.031}^{+0.033}, and [Fe/H] = 0.044_{-0.082}^{+0.080}, 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.

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Benjamin Fulton

Assistant Scientist