HAT-P-9b: A Low-Density Planet Transiting a Moderately Faint F Star

January 2009 • 2009ApJ...690.1393S

Authors • Shporer, Avi • Bakos, Gáspár Á. • Bouchy, Francois • Pont, Frederic • Kovács, Géza • Latham, Dave W. • Sipöcz, Brigitta • Torres, Guillermo • Mazeh, Tsevi • Esquerdo, Gilbert A. • Pál, András • Noyes, Robert W. • Sasselov, Dimitar D. • Lázár, József • Papp, István • Sári, Pál • Kovács, Gábor

Abstract • We report the discovery of a planet transiting a moderately faint (V = 12.3 mag) late F star, with an orbital period of 3.92289 ± 0.00004 days. From the transit light curve and radial velocity measurements, we determine that the radius of the planet is R_p = 1.40 ± 0.06 R _Jup and that the mass is M_p = 0.78 ± 0.09 M _Jup. The density of the new planet, ρ _p = 0.35 ± 0.06 g cm^-3, fits to the low-density tail of the currently known transiting planets. We find that the center of transit is at T _c = 2454417.9077 ± 0.0003 (HJD), and the total transit duration is 0.143 ± 0.004 days. The host star has M _sstarf = 1.28 ± 0.13 M _sun and R _sstarf = 1.32 ± 0.07 R _sun.

Based in part on radial velocities obtained with the SOPHIE spectrograph mounted on the 1.93 m telescope at the Observatoire de Haute Provence, France (runs 07A.PNP.MAZE, 07B.PNP.MAZE, 08A.PNP.MAZE).

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2009ApJ...690.1393S
• PDF https://stacks.iop.org/0004-637X/690/1393/pdf
• PREPRINT http://arxiv.org/abs/0806.4008
• DATA http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?type=REFERENCE&bibcode=2009ApJ...690.1393S
• DATA https://irsa.ipac.caltech.edu/bibdata/2009/S/2009ApJ...690.1393S.html
• ELECTR https://doi.org/10.1088%2F0004-637X%2F690%2F2%2F1393
• SPIRES http://inspirehep.net/search?p=find+eprint+arXiv:0806.4008