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We report the discovery of six new substellar companions of main-sequencestars, detected through multiple Doppler measurements with the instrument HARPSinstalled on the ESO 3.6m telescope, La Silla, Chile. These extrasolar planetsare orbiting the stars BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377,HD 153950. The orbital characteristics which best fit the observed data aredepicted in this paper, as well as the stellar and planetary parameters. Massesof the companions range from 2 to 18 Jupiter masses, and periods range from 100to 2000 days. The observational data are carefully analysed foractivity-induced effects and we conclude on the reliability of the observedradial-velocity variations as of exoplanetary origin. Of particular interest isthe very massive planet (or brown-dwarf companion) around the metal-rich HD131664 with M2sini= 18.15 MJup, and a 5.34-year orbital period. These newdiscoveries reinforces the observed statistical properties of the exoplanetsample as known so far.

astronomy and astrophysics

The HARPS search for southern extra-solar planets XVII. Six long-period  giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377,  HD 153950