Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-02
Astrophys.J.670:L41-L44,2007
Astronomy and Astrophysics
Astrophysics
5 pages, accepted for publication in ApJL
Scientific paper
10.1086/524058
We describe the discovery of HAT-P-4b, a low-density extrasolar planet transiting BD+36 2593, a V = 11.2 mag slightly evolved metal-rich late F star. The planet's orbital period is 3.056536+/-0.000057 d with a mid-transit epoch of 2,454,245.8154 +/- 0.0003 (HJD). Based on high-precision photometric and spectroscopic data, and by using transit light curve modeling, spectrum analysis and evolutionary models, we derive the following planet parameters: Mp= 0.68 +/- 0.04 MJ, Rp= 1.27 +/- 0.05 RJ, rho = 0.41 +/- 0.06 g cm-3 and a = 0.0446 +/- 0.0012 AU. Because of its relatively large radius, together with its assumed high metallicity of that of its parent star, this planet adds to the theoretical challenges to explain inflated extrasolar planets.
Bakos Gustav A.
Butler Paul R.
Esquerdo Gil
Fernandez José M.
Fischer Debra Ann
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