Hat-P-28b and Hat-P-29b: Two Sub-Jupiter Mass Transiting Planets

• Published in: The Astrophysical Journal
• Main Authors: Buchhave, L. A., Bakos, G. Ã., Hartman, J. D., Torres, G., Latham, D. W., Andersen, J., Kovács, G., Noyes, R. W., Shporer, A., Esquerdo, G. A., Fischer, D. A., Johnson, J. A., Marcy, G. W., Howard, A. W., Béky, B., Sasselov, D. D., Fűrész, G., Quinn, S. N., Stefanik, R. P., Szklenár, T., Berlind, P., Calkins, M. L., Lázár, J., Papp, I., Sári, P.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Astronomical Society 2011
• Subjects: planetary systems; stars: individual (HAT-P-28; GSC 2284-00503; HAT-P-29; GSC 3293-01539); techniques: photometric; techniques: spectroscopic; Jupiter; Norway; Observatorio; Iceland
• Online Access: https://doi.org/10.1088/0004-637X/733/2/116

We present the discovery of two transiting exoplanets. HAT-P-28b orbits a V = 13.03 G3 dwarf star with a period P = 3.2572 days and has a mass of 0.63 ± 0.04 M_J and a radius of 1.21^(+0.11)_(–0.08) R_J yielding a mean density of 0.44 ± 0.09 g cm^(–3). HAT-P-29b orbits a V = 11.90 F8 dwarf star with a period P = 5.7232 days and has a mass of 0.78^(+0.08)_(–0.04) M_J and a radius of 1.11^(+0.14)_(–0.08) R_J yielding a mean density of 0.71 ± 0.18 g cm^(–3). We discuss the properties of these planets in the context of other known transiting planets. © 2011 The American Astronomical Society. Received 2011 January 17; accepted 2011 March 24; published 2011 May 16. Based in part on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. 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.A´ .B. was supported by the Postdoctoral Fellowship of the NSF Astronomy and Astrophysics Program (AST-0702843 and AST-0702821, respectively). G.T. acknowledges partial support from NASA grant NNX09AF59G. We acknowledge partial support also from the Kepler mission under NASA Cooperative Agreement NCC2-1390 (PI: D.W.L.). G.K. thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-81373. This research has made use of Keck telescope time granted through NOAO (program A201Hr) and NASA (N018Hr, N167Hr). This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope and the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and ...