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A study of the host stars to exoplanets is important to understanding theirenvironment. To that end, we report new speckle observations of a sample ofexoplanet host primaries. The bright exoplanet host HD 8673 (= HIP 6702) isrevealed to have a companion, although at this time we cannot definitivelyestablish the companion as physical or optical. The observing lists for planetsearches and for these observations have for the most part been pre-screenedfor known duplicity, so the detected binary fraction is lower than what wouldotherwise be expected. Therefore, a large number of double stars were observedcontemporaneously for verification and quality control purposes, to ensure thelack of detection of companions for exoplanet hosts was valid. In theseadditional observations, ten pairs are resolved for the first time and sixtypairs are confirmed. These observations were obtained with the USNO specklecamera on the NOAO 4m telescopes at both KPNO and CTIO from 2001 to 2010.

Know the Star, Know the Planet. II. Speckle Interferometry of Exoplanet Host Stars