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Precision radial velocities from Keck/HIRES reveal a Saturn-mass planetorbiting the nearby M4V star HIP 57050. The planet has a minimum mass of 0.3Jupiter-mass, an orbital period of 41.4 days, and an orbital eccentricity of0.31. V-band photometry reveals a clear stellar rotation signature of the hoststar with a period of 98 days, well separated from the period of the radialvelocity variations and reinforcing a Keplerian origin for the observedvelocity variations. The orbital period of this planet corresponds to an orbitin the habitable zone of HIP 57050, with an expected planetary temperature ofapproximately 230 K. The star has a metallicity of [Fe/H] = 0.32+/-0.06 dex, oforder twice solar and among the highest metallicity stars in the immediatesolar neighborhood. This newly discovered planet provides further support thatthe well-known planet-metallicity correlation for F, G, and K stars alsoextends down into the M-dwarf regime. The a priori geometric probability fortransits of this planet is only about 1%. However, the expected eclipse depthis ~7%, considerably larger than that yet observed for any transiting planet.Though long on the odds, such a transit is worth pursuing as it would allow forhigh quality studies of the atmosphere via transmission spectroscopy with HST.At the expected planetary effective temperature, the atmosphere may containwater clouds.

The Lick-Carnegie Exoplanet Survey: A Saturn-Mass Planet in the Habitable Zone of the Nearby M4V Star HIP 57050