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Stellar Companions of Exoplanet Host Stars in K2

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arxiv 1805.08844 v1 pith:CU72LGZF submitted 2018-05-22 astro-ph.SR astro-ph.EP

Stellar Companions of Exoplanet Host Stars in K2

classification astro-ph.SR astro-ph.EP
keywords starshostcompanionsexoplanetplanetstellarcompaniondetection
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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    astro-ph.EP 2026-06 unverdicted novelty 5.0

    Two extremely low-density Jupiter-sized planets on long-period orbits around TOI-791 were confirmed via ground-based photometry and TTV-derived masses.