HAT-P-38b: A Saturn-Mass Planet Transiting a Late G Star

Creators: Sato, Bun'ei; Hartman, Joel D.; Bakos, Gaspar Á.; Béky, Bence; Torres, Guillermo; Latham, David W.; Kovács, Géza; Csubry, Zoltán; Penev, Kaloyan; Noyes, Robert W.; Buchhave, Lars A.; Quinn, Samuel N.; Everett, Mark; Esquerdo, Gilbert A.; Fischer, Debra A.; Howard, Andrew W.; Johnson, John A.; Marcy, Geoff W.; Sasselov, Dimitar D.; Szklenár, Tamás; Lázár, József; Papp, István; Sári, Pál

Abstract

We report on the discovery of HAT-P-38b, a Saturn-mass exoplanet, transiting the V = 12.56 dwarf star GSC 2314-00559 on a P = 4.6404 d circular orbit. The host star is a 0.89 M_⊙ late G dwarf, with solar metallicity and a radius of 0.92 R_⊙. The planetary companion has a mass of 0.27 M_J and a radius of 0.82 R_J. HAT-P-38b is one of the planets the mass and radius of which have ever been discovered to be the closest to those of Saturn.

Additional Information

© 2012 Astronomical Society of Japan. Received 2012 January 25; accepted 2012 March 13. HATNet operations have been funded by NASA grants NNG04GN74G, NNX08AF23G, NNX09AB29G and SAO IR&D grants. GT acknowledges partial support from NASA grant NNX09AF59G. We also acknowledge partial support from the Kepler Mission under NASA Cooperative Agreement NCC2-1390 (DWL, PI). GK thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-81373. This research has made use of Keck telescope time granted through NASA (N108Hr). Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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HAT-P-38b: A Saturn-Mass Planet Transiting a Late G Star

Abstract

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