Abstract
It is well established that roughly half of all nearby solar-type stars have
at least one companion. Stellar companions can have significant implications
for the detection and characterization of exoplanets, including triggering
false positives and masking the true radii of planets. Determining the fraction
of exoplanet host stars that are also binaries allows us to better determine
planetary characteristics as well as establish the relationship between
binarity and planet formation. Using high angular resolution speckle imaging,
we detect stellar companions within ~1 arcsec of K2 planet candidate host
stars. Comparing our detected companion rate to TRILEGAL star count simulations
and known detection limits of speckle imaging we estimate the binary fraction
of K2 planet host stars to be 40 - 50%, similar to that of Kepler exoplanet
hosts and field stars.
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