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Published June 20, 2011 | Published
Journal Article Open

HAT-P-27b: A Hot Jupiter Transiting a G Star on a 3 Day Orbit


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 days, the reference epoch of transit is 2455186.01879 ± 0.00054 (BJD), and the transit duration is 0.0705 ± 0.0019 days. 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 M_☉ and radius is 0.90^(+0.05)_(–0.04) R_☉. For the planetary companion we determine a mass of 0.660 ± 0.033 M_J and radius of 1.038^(+0.077)_(–0.058) R_J. For the 30 known transiting exoplanets between 0.3 M_J and 0.8 M_J, 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.

Additional Information

© 2011 American Astronomical Society. Received 2011 January 18; accepted 2011 April 8; published 2011 June 3. Based in part on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO (A201Hr) and NASA (N018Hr, N167Hr). HATNet operations have been funded by NASA grants NNG04GN74G, NNX08AF23G, and SAO IR&D grants. Work of G. Á. B. was supported by the Postdoctoral Fellowship of the NSF Astronomy and Astrophysics Program AST-0702843. G.T. acknowledges partial support from NASA grant NNX09AF59G. A.J. acknowledges support from Fondecyt project 1095213, BASAL CATA PFB-06, FONDAP CFA 15010003, MIDEPLAN ICM Nucleus P07-021-F, and Anillo ACT-086. G.K. thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-81373. L.L.K. is supported by the "Lendület" Young Researchers Program of the Hungarian Academy of Sciences and the Hungarian OTKA grants K76816, K83790 and MB08C 81013. Tamás Szalai (University of Szeged) is acknowledged for his assistance during the ANU 2.3 m observations. We also acknowledge partial support from the Kepler Mission under NASA Cooperative Agreement NCC2-1390 (D.W.L., PI). This research has made use of Keck telescope time granted through NOAO (A201Hr) and NASA (N018Hr, N167Hr). We also thank Mount Stromlo Observatory and Siding Spring Observatory for the ANU 2.3 m telescope time.

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