A Gas Giant Circumbinary Planet Transiting the F Star Primary of the Eclipsing Binary Star KIC 4862625 and the Independent Discovery and Characterization of the Two Transiting Planets in the Kepler-47 System

V. B. KOSTOV; P. R. MCCULLOUGH; T. C. HINSE; Z. I. TSVETANOV; G. HÉBRARD; R. F. DÍAZ; M. DELEUIL; J. A. VALENTI

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2013 vol. 770 p. 1 - 19

0004-637X

We report the discovery of a transiting, gas giant circumbinary planet orbiting the eclipsing binary KIC 4862625 and describe our independent discovery of the two transiting planets orbiting Kepler-47. We describe a simple and semi-automated procedure for identifying individual transits in light curves and present our follow-up measurements of the two circumbinary systems. For the KIC 4862625 system, the 0.52 ± 0.018 R Jupiter radius planet revolves every ~138 days and occults the 1.47 ± 0.08 M ⊙, 1.7 ± 0.06 R ⊙ F8 IV primary star producing aperiodic transits of variable durations commensurate with the configuration of the eclipsing binary star. Our best-fit model indicates the orbit has a semi-major axis of 0.64 AU and is slightly eccentric, e = 0.1. For the Kepler-47 system, we confirm the results of Orosz et al. Modulations in the radial velocity of KIC 4862625A are measured both spectroscopically and photometrically, i.e., via Doppler boosting, and produce similar results.