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We report the discovery of a substellar-mass companion to the K0-giant HD17092 with the Hobby-Eberly Telescope. In the absence of any correlation of theobserved 360-day periodicity with the standard indicators of stellar activity,the observed radial velocity variations are most plausibly explained in termsof a Keplerian motion of a planetary-mass body around the star. With theestimated stellar mass of 2.3Msun, the minimum mass of the planet is 4.6MJ. Theplanet's orbit is characterized by a mild eccentricity of e=0.17 and asemi-major axis of 1.3 AU. This is the tenth published detection of a planetarycompanion around a red giant star. Such discoveries add to our understanding ofplanet formation around intermediate-mass stars and they provide dynamicalinformation on the evolution of planetary systems around post-main sequencestars.

A Planetary Mass Companion to the K0 Giant HD 17092