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An important aspect of searching for exoplanets is understanding the binarityof the host stars. It is particularly important because nearly half of thesolar-like stars within our own Milky Way are part of binary or multiplesystems. Moreover, the presence of two or more stars within a system can placefurther constraints on planetary formation, evolution, and orbital dynamics. Aspart of our survey of almost a hundred host stars, we obtained images at 692 nmand 880 nm bands using the Differential Speckle Survey Instrument (DSSI) at theGemini-North Observatory. From our survey, we detect stellar companions to HD2638 and HD 164509. The stellar companion to HD 2638 has been previouslydetected, but the companion to HD 164509 is a newly discovered companion. Theangular separation for HD 2638 is $0.512 \pm 0.002\arcsec$ and for HD 164509 is$0.697 \pm 0.002\arcsec$. This corresponds to a projected separation of $25.6\pm 1.9$ AU and $36.5 \pm 1.9$ AU, respectively. By employing stellar isochronemodels, we estimate the mass of the stellar companions of HD 2638 and HD 164509to be $0.483 \pm 0.007$ $M_\sun$ and $0.416 \pm 0.007$ $M_\sun$, respectively,and their effective temperatures to be $3570 \pm 8$~K and $3450 \pm 7$~K,respectively. These results are consistent with the detected companions beinglate-type M dwarfs.

Stellar Companions to the Exoplanet Host Stars HD 2638 and HD 164509