2008A&A...480L..33T

We report the detection of two very eccentric planets orbiting HD 4113 and HD 156846 with the CORALIE Echelle spectrograph mounted on the 1.2-m Euler Swiss telescope at La Silla. The first planet, HD 4113b, has minimum mass of msin i=1.6±0.2M_Jup, a period of P=526.59±0.21days and an eccentricity of e=0.903±0.02. It orbits a metal rich G5V star at a=1.28AU, which displays an additional radial velocity drift of 28m/s/yr observed during 8 years. The combination of the radial-velocity data and the non-detection of any main sequence stellar companion in our high contrast images, taken at the VLT with NACO/SDI, characterizes the companion as a probable brown dwarf or as a faint white dwarf. The second planet, HD 156846b, has minimum mass of msin i=10.45±0.05M_Jup, a period of P=359.51±0.09days, an eccentricity of e=0.847±0.002 and is located at a=1.0AU from its parent star. HD156846 is a metal rich G0 dwarf and is also the primary of a wide binary system (a>250AU, P>4000years). Its stellar companion, IDS17147-1914B, is a M4 dwarf. The very high eccentricities of both planets can be explained by Kozai oscillations induced by the presence of a third object.