Eclipse Timing Variations of Long-Period Binaries in the Kepler Field

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Scientific paper

Prsa et al. (2011) and Slawson et al. (2011) have presented a catalog of eclipsing binaries identified in the first 130 days of Kepler data. The nearly complete and high signal-to-noise light curves give us a tremendous opportunity to measure precise eclipse times and detect deviations from a linear ephemeris, which could be caused by third bodies, among other things. Conroy et al. (2012) present eclipse times for short-period contact systems. We focus here on a subsample of about 1100 detached and semidetached binaries with periods greater than 0.9 days. We discuss the technique used to measure the times of eclipse and show several examples of binaries with large deviations (up to 5 hours) from a linear ephemeris. We give some basic statistical results from the catalog of eclipse timings, and discuss the implications for the rate of close triple star systems.
Kepler was selected as the 10th mission of the Discovery Program. Funding for this mission is provided by NASA, Science Mission Directorate. The authors acknowledge support from the
Kepler Participating Scientists Program via NASA grant NNX08AR14G.

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