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Article overview
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XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion
Binary | | Christopher J. Burke
; P. R. McCullough
; Jeff A. Valenti
; Christopher M. Johns-Krull
; Kenneth A. Janes
; J. N. Heasley
; F. J. Summers
; J. E. Stys
; R. Bissinger
; Michael L. Fleenor
; Cindy N. Foote
; Enrique Garcia-Melendo
; Bruce L. Gary
; P. J. Howell
; F. Mallia
; G. Masi
; B. Taylor
; T. Vanmunster
; | | Date: |
1 May 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | We report on a V=11.2 early K dwarf, XO-2 (GSC 03413-00005), that hosts a
Rp=0.973+0.03/-0.008 Rjup, Mp=0.57+/-0.06 Mjup transiting extrasolar planet,
XO-2b, with an orbital period of 2.615838+/-0.000008 days. XO-2 has high
metallicity, [Fe/H]=0.45+/-0.02, high proper motion, mu_tot=157 mas/yr, and has
a common proper motion stellar companion with 31" separation. The two stars are
nearly identical twins, with very similar spectra and apparent magnitudes. Due
to the high metallicity, these early K dwarf stars have a mass and radius close
to solar, Ms=0.98+/-0.02 Msolar and Rs=0.964+0.02/-0.009 Rsolar. The high
proper motion of XO-2 results from an eccentric orbit (Galactic pericenter,
Rper<4 kpc) well confined to the Galactic disk (Zmax~100 pc). In addition, the
phase space position of XO-2 is near the Hercules dynamical stream, which
points to an origin of XO-2 in the metal-rich, inner Thin Disk and subsequent
dynamical scattering into the solar neighborhood. We describe an efficient
Markov Chain Monte Carlo algorithm for calculating the Bayesian posterior
probability of the system parameters from a transit light curve. System
parameters and confidence intervals from a chi^2 minimization are also
provided. | | Source: | arXiv, arxiv.0705.0003 | | Services: | Forum | Review | PDF | Favorites | |
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