The HARPS search for southern extrasolar planets.
XXIX. Four new planets in orbit around the moderatly active dwarfs HD63765, HD104067, HD125595, and HIP 70849.

D. Ségransan, M. Mayor, S. Udry, C. Lovis, W. Benz, F. Bouchy, G. Lo Curto, C. Mordasini, C. Moutou, D. Naef, F. Pepe, D. Queloz, N. C. Santos, K. N. Abazajian

Resumo
We report the detection of four new extrasolar planets in orbit around the moderately active stars HD63765, 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 0.64M_Jup, 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=0.26AU. 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< P <75 years) and massive planet of m sin i ≈3.5-15M_Jup that orbits a late K7 dwarf.

Palavras chave
techniques: radial velocities - planetary systems - stars: individual: HD 63765 - stars: individual: HD 104067 - stars: individual: HD 125595 - stars: individual: HIP 70849

Notas
The HARPS radial velocity measurements discussed in this paper are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgibin/qcat?J/A+A/535/A54
Based on observations made with the HARPS instrument on the ESO 3.6 m telescope at La Silla Observatory under the GTO programme ID 072.C-0488.

Astronomy and Astrophysics
Volume 535, Página A54_1
novembro 2011

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