The HARPS search for southern extra-solar planets XLIII. A compact system of four super-Earth planets orbiting HD 215152

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Delisle, JB (Author) Other; Segransan, D (Author) Other; Dumusque, X (Author) Other; Diaz, RF (Author) Other; Bouchy, F (Author) Other; Lovis, C (Author) Other; Pepe, F (Author) Other; Udry, S (Author) Other; Alonso, R (Author) Other; Benz, W (Author) Other; Coffinet, A (Author) Other; Cameron, AC (Author) Other; Deleuil, M (Author) Other; Figueira, P (Author) Other; Gillon, M (Author) Other; Lo Curto, G (Author) Other; Mayor, M (Author) Other; Mordasini, C (Author) Other; Motalebi, F (Author) Other; Moutou, C (Author) Other; Pollacco, D (Author) Other; Pompei, E (Author) Other; Queloz, D (Author) Other; N.C. Santos (Author) FCUP; Wyttenbach, A (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 614

Final page: A133

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 39 Citations

Scopus - 39 Citations

Other information

Authenticus ID: P-00P-1P1

DOI: 10.1051/0004-6361/201732529

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9