HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf

May 2009 • 2009ApJ...696.1950B

Authors • Bakos, G. Á. • Pál, A. • Torres, G. • Sipőcz, B. • Latham, D. W. • Noyes, R. W. • Kovács, Géza • Hartman, J. • Esquerdo, G. A. • Fischer, D. A. • Johnson, J. A. • Marcy, G. W. • Butler, R. P. • Howard, A. W. • Sasselov, D. D. • Kovács, Gábor • Stefanik, R. P. • Lázár, J. • Papp, I. • Sári, P.

Abstract • We report on the discovery of HAT-P-10b, one of the lowest mass (0.487 ± 0.018 M _J) transiting extrasolar planets (TEPs) discovered to date by transit searches. HAT-P-10b orbits the moderately bright V = 11.89 K dwarf GSC 02340-01714, with a period P = 3.7224747 ± 0.0000065 days, transit epoch T_c = 2454759.68683 ± 0.00016 (BJD), and duration 0.1090 ± 0.0008 days. HAT-P-10b has a radius of 1.005^+0.032 _-0.027 R _J yielding a mean density of 0.594 ± 0.052 g cm^-3. Comparing these observations with recent theoretical models we find that HAT-P-10b is consistent with a ~4.5 Gyr, almost pure hydrogen and helium gas giant planet with a 10 M _⊕ core. With an equilibrium temperature of T _eq = 1020 ± 17 K, HAT-P-10b is one of the coldest TEPs. Curiously, its Safronov number θ = 0.053 ± 0.002 falls close to the dividing line between the two suggested TEP populations.

Based in part on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO (A285Hr) and NASA (N128Hr).

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Brigitta Sipőcz

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