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Quinn","submitted_at":"2010-10-05T20:03:28Z","abstract_excerpt":"We report the discovery of HAT-P-26b, a transiting extrasolar planet orbiting the moderately bright V=11.744 K1 dwarf star GSC 0320-01027, with a period P = 4.234516 +- 0.000015 d, transit epoch Tc = 2455304.65122 +- 0.00035 (BJD), and transit duration 0.1023 +- 0.0010 d. The host star has a mass of 0.82 +- 0.03 Msun, radius of 0.79 + 0.10 - 0.04 Rsun, effective temperature 5079 +- 88 K, and metallicity [Fe/H] = -0.04 +- 0.08. The planetary companion has a mass of 0.059 +- 0.007 MJ, and radius of 0.565 + 0.072 - 0.032 RJ yielding a mean density of 0.40 +- 0.10 g cm-3. 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W. Howard, B. B\\'eky, D. A. Fischer, D. D. Sasselov, D. M. Kipping, D. W. Latham, G. \\'A. Bakos, G. A. Esquerdo, G. Kov\\'acs, G. Perumpilly, G. Torres, G. W. Marcy, H. Isaacson, I. Papp, J. A. Johnson, J. D. Hartman, J. L\\'az\\'ar, L. A. Buchhave, M. Everett, P. S\\'ari, R. P. Stefanik, R. W. Noyes, S. N. Quinn","submitted_at":"2010-10-05T20:03:28Z","abstract_excerpt":"We report the discovery of HAT-P-26b, a transiting extrasolar planet orbiting the moderately bright V=11.744 K1 dwarf star GSC 0320-01027, with a period P = 4.234516 +- 0.000015 d, transit epoch Tc = 2455304.65122 +- 0.00035 (BJD), and transit duration 0.1023 +- 0.0010 d. The host star has a mass of 0.82 +- 0.03 Msun, radius of 0.79 + 0.10 - 0.04 Rsun, effective temperature 5079 +- 88 K, and metallicity [Fe/H] = -0.04 +- 0.08. The planetary companion has a mass of 0.059 +- 0.007 MJ, and radius of 0.565 + 0.072 - 0.032 RJ yielding a mean density of 0.40 +- 0.10 g cm-3. 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