Journal
ASTRONOMY & ASTROPHYSICS
Volume 614, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201732529
Keywords
planets and satellites: general; planets and satellites: detection; planets and satellites: dynamical evolution and stability
Categories
Funding
- Swiss National Science Foundation (SNSF)
- SNSF
- Branco Weiss Fellowship-Society in Science
- POPH/FSE (EC) by FEDER through the program Programa Operacional de Factores de Competitividade - COMPETE
- Fundacao para a Ciencia e a Tecnologia (FCT) [IF/01037/2013/CP1191/CT0001, IF/00169/2012/CP0150/CT0002]
- Spanish Ministry of Economy and Competitiveness (MINECO) [RYC-2010-06519, RETOS ESP2014-57495-C2-1-R, ESP2016-80435-C2-2-R]
- Fundação para a Ciência e a Tecnologia [IF/01037/2013/CP1191/CT0001, IF/00169/2012/CP0150/CT0002] Funding Source: FCT
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We report the discovery of four super-Earth planets around HD 215152, with orbital periods of 5.76, 7.28, 10.86, and 25.2 d, and minimum masses of 1.8, 1.7, 2.8, and 2.9 M-circle plus respectively. This discovery is based on 373 high-quality radial velocity measurements taken by HARPS over 13 yr. Given the low masses of the planets, the signal-to-noise ratio is not sufficient to constrain the planet eccentricities. However, a preliminary dynamical analysis suggests that eccentricities should be typically lower than about 0 : 03 for the system to remain stable. With two pairs of planets with a period ratio lower than 1.5, with short orbital periods, low masses, and low eccentricities, HD 215152 is similar to the very compact multi-planet systems found by Kepler, which is very rare in radial-velocity surveys. This discovery proves that these systems can be reached with the radial-velocity technique, but characterizing them requires a huge amount of observations.
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