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

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 Rp = 1.40 ± 0.06 R Jup and that the mass is Mp...

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Bibliographic Details
Published in:The Astrophysical journal 2009, Vol.690 (2), p.1393-1400
Main 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
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Sciences of the Universe
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Summary: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 Rp = 1.40 ± 0.06 R Jup and that the mass is Mp = 0.78 ± 0.09 M Jup. The density of the new planet, rho 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 = 1.28 ± 0.13 M and R = 1.32 ± 0.07 R.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/690/2/1393