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Most Sun-like stars in the Galaxy reside in gravitationally-bound pairs ofstars called "binary stars". While long anticipated, the existence of a"circumbinary planet" orbiting such a pair of normal stars was not definitivelyestablished until the discovery of Kepler-16. Incontrovertible evidence wasprovided by the miniature eclipses ("transits") of the stars by the planet.However, questions remain about the prevalence of circumbinary planets andtheir range of orbital and physical properties. Here we present two additionaltransiting circumbinary planets, Kepler-34 and Kepler-35. Each is a low-densitygas giant planet on an orbit closely aligned with that of its parent stars.Kepler-34 orbits two Sun-like stars every 289 days, while Kepler-35 orbits apair of smaller stars (89% and 81% of the Sun's mass) every 131 days. Due tothe orbital motion of the stars, the planets experience large multi-periodicvariations in incident stellar radiation. The observed rate of circumbinaryplanets implies > ~1% of close binary stars have giant planets in nearlycoplanar orbits, yielding a Galactic population of at least several million.

The Transiting Circumbinary Planets Kepler-34 and Kepler-35