The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47186 and HD181433
F. Bouchy, M. Mayor, C. Lovis, S. Udry, W. Benz, J-L Bertaux, X., Delfosse, C. Mordasini, F. Pepe, D. Queloz, D. Segransan

TL;DR
This paper reports the discovery of two new multiple planet systems around stars HD47186 and HD181433, including super-Earth, Neptune, and Jupiter-mass planets, highlighting the prevalence of multi-planet systems with low-mass exoplanets.
Contribution
First detection of multiple planet systems around HD47186 and HD181433, expanding knowledge of low-mass exoplanets in multi-planet configurations.
Findings
Discovered a hot Neptune and a Saturn-mass planet in one system.
Identified a super-Earth and two Jupiter-mass planets in another system.
Confirmed that 80% of low-mass exoplanets are in multiple systems.
Abstract
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 0.54 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 a multiple planetary systems.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Astrophysics and Star Formation Studies
