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Sasselov (1), Dept. of Astrophysics, D. M. Kipping (1, D. W. Latham (1), G. A. Bakos (1, G. A. Esquerdo (1), Geza Kovacs (6), G. Perumpilly (1), G. Torres (1), G. W. Marcy (7), I. Papp (10), J. A. Johnson (9), J. Hartman (1), J. Lazar (10), P. Sari (10) ((1) Harvard-Smithsonian Center for Astrophysics, R. P. Stefanik (1), R. W. Noyes (1), Santa Barbara, University College London, Yale University","submitted_at":"2010-08-19T20:01:03Z","abstract_excerpt":"We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V=11.818 F8 dwarf star GSC 0774-01441, with a period P = 3.3552464 +/- 0.0000071 d, transit epoch Tc = 2455216.97669 +/- 0.00024 (BJD_UTC), and transit duration 3.653 +/- 0.025 hours. The host star has a mass of 1.191 +/- 0.042 Msun, radius of 1.317 +/- 0.068 Rsun, effective temperature 6373 +/- 80 K, and a low metallicity of [Fe/H] = -0.16 +/- 0.08. The planetary companion has a mass of 0.681 +/- 0.031 MJ, and radius of 1.243 +/- 0.072 RJ yielding a mean density of 0.439 +/- 0.069 g cm-3 . 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Shporer (4, A. W. Howard (7), B. Beky (1), Berkeley, D. A. Fischer (8), D. D. Sasselov (1), Dept. of Astrophysics, D. M. Kipping (1, D. W. Latham (1), G. A. Bakos (1, G. A. Esquerdo (1), Geza Kovacs (6), G. Perumpilly (1), G. Torres (1), G. W. Marcy (7), I. Papp (10), J. A. Johnson (9), J. Hartman (1), J. Lazar (10), P. Sari (10) ((1) Harvard-Smithsonian Center for Astrophysics, R. P. Stefanik (1), R. W. Noyes (1), Santa Barbara, University College London, Yale University","submitted_at":"2010-08-19T20:01:03Z","abstract_excerpt":"We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V=11.818 F8 dwarf star GSC 0774-01441, with a period P = 3.3552464 +/- 0.0000071 d, transit epoch Tc = 2455216.97669 +/- 0.00024 (BJD_UTC), and transit duration 3.653 +/- 0.025 hours. The host star has a mass of 1.191 +/- 0.042 Msun, radius of 1.317 +/- 0.068 Rsun, effective temperature 6373 +/- 80 K, and a low metallicity of [Fe/H] = -0.16 +/- 0.08. 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