The HARPS search for southern extra-solar planets - XXIX. Four new planets in orbit around the moderatly active dwarfs HD?63765, HD?104067, HD?125595, and HIP?70849

摘要

We report the detection of four new extrasolar planets in orbit around the moderately active stars HD?63765, HD?104067, HIP?70849, and HD?125595 with the HARPS Echelle spectrograph mounted on the ESO 3.6-m telescope at La?Silla. The first planet, HD?63765?b, has a minimum mass of 0.64?MJup, a?period of 358?days, and an eccentricity of?0.24. It?orbits a?G9?dwarf at?0.94?AU. The second planet, HD?104067?b, is?a?3.6 Neptune-mass-planet with a 55.8-day-period. It?orbits its parent K2?dwarf, in a circular orbit with a semi-major axis of a?= 0.26?AU. Radial velocity measurements present a ?≈?500-day-oscillation that reveals significant magnetic cycles. The third planet is a 0.77?Neptune-mass-planet in circular orbit around the K4?dwarf, HD?12595, with a 9.67-day-period. Finally, HIP?7849?b is a long-period (5??