HAT-P-4b: A metal-rich low-density transiting hot Jupiter

Details HAT-P-4b: A metal-rich low-density transiting hot Jupiter HAT-P-4b: A metal-rich low-density transiting hot Jupiter

2007-10-02

arxiv.org/abs/0710.0602v1

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.

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