Astronomy and Astrophysics, volume 480, L33-36 (2008/3-4)
The CORALIE survey for southern extra-solar planets. XV. Discovery of two eccentric planets orbiting HD 4113 and HD 156846.
TAMUZ O., SEGRANSAN D., UDRY S., MAYOR M., EGGENBERGER A., NAEF D., PEPE F., QUELOZ D., SANTOS N.C., DEMORY B.-O., FIGUERA P., MARMIER M. and MONTAGNIER G.
Abstract (from CDS):
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±0.2MJup
, 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±0.05MJup
, 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.
stars: planetary systems - techniques: radial velocities - methods: observational - stars: low-mass, brown dwarfs
VizieR on-line data:
<Available at CDS (J/A+A/480/L33): table1.dat table2.dat>
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