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We aim to detect and characterize substellar companions to K giant stars, tofurther our knowledge of planet formation and stellar evolution ofintermediate-mass stars. For more than a decade we have used Dopplerspectroscopy to acquire high precision radial velocity measurements of K giantstars. All data for this survey have been taken at Lick Observatory. Our surveyincludes 373 G and K giants. Radial velocity data showing periodic variationsare fitted with Keplerian orbits using a chi^2 minimization technique. Wereport the presence of two substellar companions to the K giant stars tau Gemand 91 Aqr. The brown dwarf orbiting tau Gem has an orbital period of 305.5 +/-0.1 days, a minimum mass of 20.6 M_Jup, and an eccentricity of 0.031 +/- 0.009.The planet orbiting 91 Aqr has an orbital period of 181.4 +/- 0.1 days, aminimum mass of 3.2 M_Jup, and an eccentricity of 0.027 +/- 0.026. Bothcompanions have exceptionally circular orbits for their orbital distance, ascompared to all previously discovered planetary companions.

Precise radial velocities of giant stars V. A brown dwarf and a planet orbiting the K giant stars tau Gem and 91 Aqr