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

Autor:	Dimitar Sasselov, Gáspár Á. Bakos, András Pál, Guillermo Torres, J. Lázár, Geoff Marcy, Istvan Papp, R. W. Noyes, Debra A. Fischer, Alessandro Sozzetti, G. A. Esquerdo, Robert P. Stefanik, David W. Latham, P. Sári, J. M. Fernandez, R. P. Butler, Géza Kovács
Jazyk:	angličtina
Rok vydání:	2007
Předmět:	Physics Metallicity Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Radius Astrophysics Light curve Orbital period Exoplanet Space and Planetary Science Planet Hot Jupiter Transit (astronomy)
Popis:	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
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb5f22373d608ded0cbbd3873807612b http://arxiv.org/abs/0710.0602 Zobrazit plný text záznamu