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We present precision radial velocity (RV) data that reveal a multipleexoplanet system orbiting the bright nearby G5V star 61 Virginis. Our 4.6 yearsof combined Keck/HIRES and Anglo-Australian Telescope precision RVs indicatethe hitherto unknown presence of at least three planets orbiting thiswell-studied star. These planets are all on low-eccentricity orbits withperiods of 4.2, 38.0, and 124.0 days, and projected masses (M sini) of 5.1,18.2, and 24.0 M_Earth, respectively. Test integrations of systems consistentwith the RV data suggest that the configuration is dynamically stable.Depending on the effectiveness of tidal dissipation within the inner planet,the inner two planets may have evolved into an eccentricity fixed-pointconfiguration in which the apsidal lines of all three planets corotate. Thisconjecture can be tested with additional observations. We present a 16-yeartime series of photometric observations of 61 Virginis, which comprise 1194individual measurements, and indicate that it has excellent photometricstability. No significant photometric variations at the periods of the proposedplanets have been detected. This new system is the first known example of aG-type Sun-like star hosting a Super-Earth mass planet. It joins HD 75732 (55Cnc), HD 69830, GJ 581, HD 40307, and GJ 876 as a growing group of exoplanetsystems that have multiple planets orbiting with periods less than anEarth-year. The ubiquity of such systems portends that space-basedtransit-search missions such as KEPLER and COROT will find manymulti-transiting systems.

A Super-Earth and two Neptunes Orbiting the Nearby Sun-like star 61 Virginis