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Béky, Bence; Bakos, Gáspár Á; Hartman, Joel; Torres, Guillermo; Latham, David W; Jordán, Andres; Arriagada, Pamela; Bayliss, Daniel; Kiss, László L; Kovács, Géza; Quinn, Sam N; Marcy, Geoffrey W; Howard, Andrew W; Fischer, Debra A; Johnson, John A; Esquerdo, Gilbert A; Noyes, Robert W; Buchhave, Lars A; Sasselov, Dimitar D; Stefanik, Robert P; Gopakumar Perumpilly; Lázár, József; Papp, István; Sári, Pál
arXiv.org, 03/2011Paper, Journal Article
We report the discovery of HAT-P-27b, an exoplanet transiting the moderately bright G8 dwarf star GSC 0333-00351 (V=12.214). The orbital period is 3.039586 +/- 0.000012 d, the reference epoch of transit is 2455186.01879 +/- 0.00054 (BJD), and the transit duration is 0.0705 +/- 0.0019 d. The host star with its effective temperature 5300 +/- 90 K is somewhat cooler than the Sun, and is more metal-rich with a metallicity of +0.29 +/- 0.10. Its mass is 0.94 +/- 0.04 Msun and radius is 0.90 +/- 0.04 Rsun. For the planetary companion we determine a mass of 0.660 +/- 0.033 MJ and radius of 1.038 +0.077 -0.058 RJ. For the 30 known transiting exoplanets between 0.3 MJ and 0.8 MJ, a negative correlation between host star metallicity and planetary radius, and an additional dependence of planetary radius on equilibrium temperature are confirmed at a high level of statistical significance.
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