Volume 496, Number 2, March III 2009
|Page(s)||527 - 531|
|Section||Planets and planetary systems|
|Published online||14 January 2009|
XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD 47 186 and HD 181 433
Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France e-mail: email@example.com
2 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
3 Physikalisches Institut Universitat Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
4 Service d'Aéronomie du CNRS, BP 3, 91371 Verrières-le-Buisson, France
5 Laboratoire d'Astrophysique, Observatoire de Grenoble, Université J. Fourier, BP 53, 38041 Grenoble, Cedex 9, France
Accepted: 20 November 2008
We report on the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433. The first system contains a hot Neptune of 22.78 with a 4.08-day period and a Saturn of 0.35 MJUP with a 3.7-year period. The second system contains a Super-Earth of 7.5 with a 9.4-day period, a 0.64 MJUP with a 2.6-year period, and a third companion of 0.54 MJUP with a period of about 6 years. These detections increase to 20 the number of close-in low-mass exoplanets (below 0.1 MJUP) and strengthen the fact that 80% of these planets are in multiple planetary systems.
Key words: stars: planetary systems / techniques: radial velocities / stars: individual: HD 47 186 / stars: individual: HD 181 433
Based on observations made with HARPS spectrograph on the 3.6-m ESO telescope at La Silla Observatory under the GTO programme ID 072.C-0488.
© ESO, 2009
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