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HD 177830 is an evolved K0IV star with two known exoplanets. In addition tothe planetary companions it has a late-type stellar companion discovered withadaptive optics imagery. We observed the binary star system with the PHAROnear-IR camera and the Project 1640 coronagraph. Using the Project 1640coronagraph and integral field spectrograph we extracted a spectrum of thestellar companion. This allowed us to determine that the spectral type of thestellar companion is a M4$\pm$1V. We used both instruments to measure theastrometry of the binary system. Combining these data with published data, wedetermined that the binary star has a likely period of approximately 800 yearswith a semi-major axis of 100-200 AU. This implies that the stellar companionhas had little or no impact on the dynamics of the exoplanets. The astrometryof the system should continue to be monitored, but due to the slow nature ofthe system, observations can be made once every 5-10 years.

Know the Star, Know the Planet. V. Characterization of the Stellar Companion to the Exoplanet Host HD 177830