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We plan to measure the angular diameters of a sample of Penn State-TorunPlanet Search (PTPS) giant exoplanet host star candidates using the NavyPrecision Optical Interferometer. The radii of evolved giant stars obtainedusing spectroscopy are usually ill-defined because of the method's indirectnature and evolutionary model dependency. The star's radius is a criticalparameter used to calculate luminosity and mass, which are often not well knownfor giant stars. Therefore, this problem also affects the orbital period, mass,and surface temperature of the planet. Our interferometric observations willsignificantly decrease the errors for these parameters. We present preliminaryresults from NPOI observations of six stars in the PTPS sample.

Observing the PTPS Sample of Evolved Exoplanet Host Candidates Using the NPOI