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28 March 2024
 
  » arxiv » arxiv.0705.0126

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HAT-P-2b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
G. A. Bakos ; G. Kovacs ; G. Torres ; D. A. Fischer ; D. W. Latham ; R. W. Noyes ; D. D. Sasselov ; T. Mazeh ; A. Shporer ; R. P. Butler ; R. P. Stefanik ; J. M. Fernandez ; A. Sozzetti ; A. Pal ; J. Johnson ; G. W. Marcy ; B. Sipocz ; J. Lazar ; I. Papp ; P. Sari ;
Date 1 May 2007
Subject Astrophysics (astro-ph)
AbstractWe report the discovery of HAT-P-2b, a massive (Mp=8.17+/-0.72 M_Jup) planet transiting the bright (V=8.7) F8 star HD 147506, with an orbital period of 5.63 days and an eccentricity of e=0.5. From the transit light curve we determine that the radius of the planet is Rp = 1.18+/-0.16 R_Jup. HAT-P-2b has a mass about 9 times the average mass of previously-known transiting exoplanets, and a density of rho = 6.6gcm^-3, similar to that of rocky planets like the Earth. Nevertheless, its mass and radius are in accord with theories of structure of massive giant planets composed of pure H and He. The high eccentricity causes a 9-fold variation of insolation of the planet between peri- and apastron.
Source arXiv, arxiv.0705.0126
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