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We report the detection of a double planetary system around HD 140718 as wellas the discovery of two long period and massive planets orbiting HD 171238 andHD 204313. Those discoveries were made with the CORALIE Echelle spectrographmounted on the 1.2-m Euler Swiss telescope located at La Silla Observatory,Chile. The planetary system orbiting the nearby G9 dwarf HD 147018 is composedof an eccentric inner planet (e=0.47) with twice the mass of Jupiter (2.1 MJup) and with an orbital period of 44.24 days. The outer planet is even moremassive (6.6 MJup) with a slightly eccentric orbit (e=0.13) and a period of1008 days. The planet orbiting HD 171238 has a minimum mass of 2.6 MJup, aperiod of 1523 days and an eccentricity of 0.40. It orbits a G8 dwarfs at 2.5AU. The last planet, HD 204313 b, is a 4.0 MJup -planet with a period of 5.3years and has a low eccentricity (e = 0.13). It orbits a G5 dwarfs at 3.1 AU.The three parent stars are metal rich, which further strengthened the case thatmassive planets tend to form around metal rich stars.

astronomy and astrophysics

The CORALIE survey for southern extrasolar planets. XVI. Discovery of a  planetary system around HD 147018 and of two long period and massive planets  orbiting HD 171238 and HD 204313