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The vast diversity of planetary systems detected to date is defying ourcapability of understanding their formation and evolution. Well-definedvolume-limited surveys are the best tool at our disposal to tackle the problem,via the acquisition of robust statistics of the orbital elements. We are usingthe HARPS spectrograph to conduct our survey of ~850 nearby solar-type stars,and in the course of the past nine years we have monitored the radial velocityof HD103774, HD109271, and BD-061339. In this work we present the detection offive planets orbiting these stars, with m*sin(i) between 0.6 and 7 Neptunemasses, four of which are in two multiple systems, comprising one super-Earthand one planet within the habitable zone of a late-type dwarf. Although forstrategic reasons we chose efficiency over precision in this survey, we havethe capability to detect planets down to the Neptune and super-Earth massrange, as well as multiple systems, provided that enough data points are madeavailable.

The HARPS search for southern extrasolar planets: XXXIII. New  multi-planet systems in the HARPS volume limited sample: a super-Earth and a  Neptune in the habitable zone