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The planet occurrence rate for multiple stars is important in two aspects.First, almost half of stellar systems in the solar neighborhood are multiplesystems. Second, the comparison of the planet occurrence rate for multiplestars to that for single stars sheds light on the influence of stellarmultiplicity on planet formation and evolution. We developed a method ofdistinguishing planet occurrence rates for single and multiple stars. From asample of 138 bright (KP <13.5) Kepler multi-planet candidate systems, wecompared the stellar multiplicity rate of these planet host stars to that offield stars. Using dynamical stability analyses and archival Dopplermeasurements, we find that the stellar multiplicity rate of planet host starsis significantly lower than field stars for semi-major axes less than 20 AU,suggesting that planet formation and evolution are suppressed by the presenceof a close-in companion star at these separations. The influence of stellarmultiplicity at larger separations is uncertain because of search in-completeness due to a limited Doppler observation time baseline and a lack ofhigh resolution imaging observation. We calculated the planet confidence forthe sample of mutlti-planet candidates, and find that the planet confidencesfor KOI 82.01, KOI 115.01, KOI 282.01 and KOI 1781.02 are higher than 99.7% andthus validate the planetary nature of these four planet candidates. This sampleof bright Kepler multi-planet candidates with refined stellar and orbitalparameters, planet confidence estimation, and nearby stellar companionidentification offers a well-characterized sample for future theoretical andobservational study.

astrophysical journal/the astrophysical journal

Influence of Stellar Multiplicity On Planet Formation. I. Evidence of  Suppressed Planet Formation Due to Stellar Companions Within 20 AU and  Validation of Four Planets From the Kepler Multiple Planet Candidates