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The HARPS search for southern extra-solar planets.: XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47 186 and HD181 433

Abstract : 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 M ⊕ with a 4.08-day period and a Saturn of 0.35 M JUP with a 3.7-year period. The second system contains a Super-Earth of 7.5 M ⊕ with a 9.4-day period, a 0.64 M JUP with a 2.6-year period, and a third companion of 0.54 M 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 multiple planetary systems.
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François Bouchy, M. Mayor, C. Lovis, S. Udry, W. Benz, et al.. The HARPS search for southern extra-solar planets.: XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47 186 and HD181 433. Astronomy and Astrophysics - A&A, EDP Sciences, 2009, 496 (2), pp.527-531. ⟨10.1051/0004-6361:200810669⟩. ⟨hal-00370485⟩

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