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Centro de Astrofísica da Universidade do Porto

The HARPS search for southern extra-solar planets
XXII. Multiple planet systems from the HARPS volume limited sample

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

Abstract
We present the detections of three multiple systems within the HARPS volume-limited sample. Among the six planets discussed in this paper, we have identified a "super-Earth" planet with a minimum mass of 6.6 MEarth and a "Neptune" planet with minimum mass of 18 MEarth, both orbiting their parent stars within a distance of 0.05 AU and a period of approximately four days. These detections strengthen the argument that low-mass planets are primarily found in multiple-planetary systems.

Keywords
planets and satellites: individual: HD125612 – planets and satellites: individual: HD215497 – planets and satellites: individual: HIP 5158 – techniques: radial velocities – techniques: spectroscopic – plan

Notes
Based on observations made with the HARPS instrument on the ESO 3.6 m telescope at La Silla (Chile), under the GTO program ID 072.C-0488.
RV tables 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/cgi-bin/qcat?J/A+A/512/A48

Astronomy and Astrophysics
Volume 512, Page A48_1
March 2010

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