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, Zlatan Tsvetanov, G. Hébrard, R. F. Díaz, M. Deleuil, J. A. Valenti

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Abstract

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 RJupiter 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.

Original languageEnglish
Article number52
JournalAstrophysical Journal
Volume770
Issue number1
DOIs
Publication statusPublished - 10 Jun 2013
Externally publishedYes

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Keywords

  • binaries: eclipsing
  • planetary systems
  • stars: individual (KIC 4862625 Kepler-47)
  • techniques: photometric

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Space and Planetary Science
  • Astronomy and Astrophysics

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