The HARPS search for southern extra-solar planets. XLIII. A compact system of four super-Earth planets orbiting HD 215152
Abstract
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⊕ respectively. This discovery is based on 373 high-quality radial velocity measurements taken by HARPS over 13 years. 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.
Citation
Delisle , J-B , Ségransan , D , Dumusque , X , Diaz , R F , Bouchy , F , Lovis , C , Pepe , F , Udry , S , Alonso , R , Benz , W , Coffinet , A , Collier Cameron , A , Deleuil , M , Figueira , P , Gillon , M , Lo Curto , G , Mayor , M , Mordasini , C , Motalebi , F , Moutou , C , Pollacco , D , Pompei , E , Queloz , D , Santos , N C & Wyttenbach , A 2018 , ' The HARPS search for southern extra-solar planets. XLIII. A compact system of four super-Earth planets orbiting HD 215152 ' , Astronomy & Astrophysics , vol. 614 , A133 . https://doi.org/10.1051/0004-6361/201732529
Publication
Astronomy & Astrophysics
Status
Peer reviewed
ISSN
0004-6361Type
Journal article
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