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

Abstract

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.

5 pages, accepted for publication in ApJL

References in corpus (14)

• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• Possible Solutions to the Radius Anomalies of Transiting Giant Planets
• A correlation between the heavy element content of transiting extrasolar planets and the metallicity of their parent stars
• Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2
• Heat transport in giant (exo)planets: a new perspective
• HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
• TASS Mark IV Photometric Survey of the Northern Sky
• HAT-P-3b: A heavy-element rich planet transiting a K dwarf star
• TrES-4: A Transiting Hot Jupiter of Very Low Density
• The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b
• Astrometry in Wide-field Surveys
• Searching for Earth analogues around the nearest stars: the disk age-metallicity relation and the age distribution in the Solar Neighbourhood
• WASP-1: A lithium- and metal-rich star with an oversized planet
• Photometric follow-up of the transiting planet WASP-1b

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