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We report the detection of three new extrasolar planets orbiting the solartype stars HD 85390, HD 90156 and HD 103197 with the HARPS spectrograph mountedon the ESO 3.6-m telescope at La Silla observatory. HD 85390 has a planetarycompanion with a projected intermediate mass (42.0 Earth masses) on a 788-dayorbit (a=1.52 AU) with an eccentricity of 0.41, for which there is no analoguein the solar system. A drift in the data indicates the presence of anothercompanion on a long period orbit, which is however not covered by ourmeasurements. HD 90156 is orbited by a warm Neptune analogue with a minimummass of 17.98 Earth masses (1.05 Neptune masses), a period of 49.8 days (a=0.25AU) and an eccentricity of 0.31. HD 103197 has an intermediate mass planet on acircular orbit (P=47.8 d, Msini=31.2 Earth masses). We discuss the formation ofplanets of intermediate mass (about 30-100 Earth masses) which should be rareinside a few AU according to core accretion formation models.

astronomy and astrophysics

The HARPS search for southern extra-solar planets. XXIV. Companions to  HD 85390, HD 90156 and HD 103197: A Neptune analogue and two intermediate  mass planets