arXiv: 0812.1608

Date: Tue, 9 Dec 2008 02:06:22 GMT (240kb,D)

Title: The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47186 and HD181433

Authors: F. Bouchy, M. Mayor, C. Lovis, S. Udry, W. Benz, J-L Bertaux, X.Delfosse, C. Mordasini, F. Pepe, D. Queloz, D. Segransan

Categories: astro-ph

Comments: 5 pages, 5 figures, accepted in A&A

This paper reports on the detection of two new multiple planet systems around solar-like stars HD47186 and HD181433. The first system includes a hot Neptune of 22.78 M_Earth at 4.08-days period and a Saturn of 0.35 M_Jup at 3.7-years period. The second system includes a Super-Earth of 7.5 M_Earth at 9.4-days period, a 0.64 M$_Jup at 2.6-years period as well as a third companion of 0.54M_Jup with a period of about 6 years.

These detections increase to 20 the number of close-in low-mass exoplanets (below 0.1 M_Jup) and strengthen the fact that 80% of these planets are in a multiple planetary systems.

http://arxiv.org/abs/0812.1608 , 240kb