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Torres(2), G. W. Marcy(4), H. Isaacson(4), Institut f\\\"ur Astrophysik), I. Papp(7), J. A. Johnson(6), J. D. Hartman(2), J. L\\'az\\'ar(7), J. M. Fernandez(2, P. S\\'ari(7), R. P. Stefanik(2), R. W. Noyes(2), University of California (5) Department of Astronomy, Yale University (6) California Institute of Technology","submitted_at":"2010-05-28T14:43:31Z","abstract_excerpt":"We report the discovery of HAT-P-15b, a transiting extrasolar planet in the `period valley', a relatively sparsely-populated period regime of the known extrasolar planets. The host star, GSC 2883-01687, is a G5 dwarf with V=12.16. It has a mass of 1.01+/-0.04 M(Sun), radius of 1.08+/-0.04 R(Sun), effective temperature 5568+/-90 K, and metallicity [Fe/H] = +0.22+/-0.08. The planetary companion orbits the star with a period 10.863502+/-0.000027 days, transit epoch Tc = 2454638.56019+/-0.00048 (BJD), and transit duration 0.2285+/-0.0015 days. 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