Refined stellar, orbital and planetary parameters of the eccentric HATP2 planetary system
Abstract
We present refined parameters for the extrasolar planetary system HATP2 (also known as HD147506), based on new radial velocity and photometric data. HATP2b is a transiting extrasolar planet that exhibits an eccentric orbit. We present a detailed analysis of the planetary and stellar parameters, yielding consistent results for the mass and radius of the star, better constraints on the orbital eccentricity and refined planetary parameters. The improved parameters for the host star are M_{*} = 1.36 +/ 0.04M_{solar} and R_{*} = 1.64 +/ 0.08 R_{solar}, while the planet has a mass of M_{p} = 9.09 +/ 0.24M_{Jup} and radius of R_{p} = 1.16 +/ 0.08R_{Jup}. The refined transit epoch and period for the planet are E = 2454387.49375 +/ 0.00074(BJD) and P = 5.6334729 +/ 0.0000061(d), and the orbital eccentricity and argument of periastron are e = 0.5171 +/ 0.0033 and . These orbital elements allow us to predict the timings of secondary eclipses with a reasonable accuracy of ~15min. We also discuss the effects of this significant eccentricity including the characterization of the asymmetry in the transit light curve. Simple formulae are presented for the above, and these, in turn, can be used to constrain the orbital eccentricity using purely photometric data. These will be particularly useful for very high precision, spaceborne observations of transiting planets.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 February 2010
 DOI:
 10.1111/j.13652966.2009.15849.x
 arXiv:
 arXiv:0908.1705
 Bibcode:
 2010MNRAS.401.2665P
 Keywords:

 techniques: spectroscopic;
 stars: fundamental parameters;
 stars: individual: HD147506;
 HATP2;
 planetary systems;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 Revised version, accepted for publication in MNRAS, 11 pages, 6 figures