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

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 Tc =...

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Published in:The Astrophysical journal 2009-05, Vol.696 (2), p.1950-1955
Main 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
Format: Article
Language:English
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Summary: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 Tc = 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 {circled plus} core. With an equilibrium temperature of T eq = 1020 ± 17 K, HAT-P-10b is one of the coldest TEPs. Curiously, its Safronov number c = 0.053 ± 0.002 falls close to the dividing line between the two suggested TEP populations.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/696/2/1950