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Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system | | András Pál
; Gáspár Á. Bakos
; Guillermo Torres
; Robert W. Noyes
; Debra A. Fischer
; John A. Johnson
; Gregory W. Henry
; R. Paul Butler
; Geoffrey W. Marcy
; Andrew W. Howard
; Brigitta Sipőcz
; David W. Latham
; Gilbert A. Esquerdo
; | | Date: |
12 Aug 2009 | | Abstract: | We present refined parameters for the HAT-P-2(b) extrasolar planetary system
(also known as HD 147506(b)), based on new radial velocity and photometric
data. HAT-P-2(b) is a transiting extrasolar planet (TEP) that exhibits an
eccentric orbit. We present detailed analysis of the planetary and stellar
parameters, yielding consistent results of the mass and radius of the star,
better constraints on the orbital eccentricity and refined planetary
parameters. Namely, the refined stellar parameters are M_star = 1.36 +/- 0.04
M_sun and R_star = 1.64 +0.09 -0.08 R_sun, while the planet has a mass of M_p =
9.09 +/- 0.24 M_Jup and radius of R_p = 1.157 +0.073 -0.092 R_Jup. The refined
ephemeris for the planet are E = 2,454,387.49375 +/- 0.00074 (BJD) and P =
5.6334729 +/- 0.0000061 (days) while the newly obtained orbital eccentricity
and argument of pericenter are e = 0.5171 +/- 0.0033 and omega = 185.22 +/-
0.95 degs. These orbital elements allow us to predict the timings of secondary
eclipses with a reasonable accuracy. We also discuss effects of this
significant eccentricity, such as the time-lag between the radial velocity and
photometry based transit centers, or 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, space-borne observations of TEPs. | | Source: | arXiv, 0908.1705 | | Services: | Forum | Review | PDF | Favorites | |
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