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

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, Michaël; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Moutou, C.; Pollacco, D.; Pompei, E.; Queloz, D.; Santos, N. C.; Wyttenbach, A.

doi:10.1051/0004-6361/201732529

Article (Scientific journals)

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

Delisle, J.-B.; Ségransan, D.; Dumusque, X. et al.

2018 • In Astronomy and Astrophysics, 614

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/229257

DOI
10.1051/0004-6361/201732529

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Keywords :

Planets and satellites: detection; Planets and satellites: dynamical evolution and stability; Planets and satellites: general; Extrasolar planets; Satellites; Signal to noise ratio; Compact system; Dynamical analysis; Orbital periods; Planets and satellites: detections; Planets and satellites: dynamical evolution and stabilities; Radial velocity; Radial velocity measurements; Orbits

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· 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. © 2018 ESO.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Delisle, J.-B.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland, ASD, IMCCE, Observatoire de Paris, PSL Research University, UPMC Univ. Paris 6, CNRS, 77 avenue Denfert-Rochereau, Paris, France

Ségransan, D.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Dumusque, X.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Diaz, R. F.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina, CONICET-Universidad de Buenos Aires, Instituto de Astronomía y Física Del Espacio (IAFE), Buenos Aires, Argentina

Bouchy, F.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Lovis, C.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Pepe, F.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Udry, S.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, Switzerland

Alonso, R.; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, Dpto. de Astrofísica, Universidad de la Laguna, La Laguna, Tenerife, Spain

Benz, W.; Physikalisches Institut, Universitat Bern, Silderstrasse 5, Bern, Switzerland

More authors (15 more)

Language :

English

Title :

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

Publication date :

2018

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

614

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Branco Weiss Fellowship – Society in Science; FEDER program “Programa Operacional de Factores de Competitividade - COMPETE”; Ramón y Cajal program RYC-2010-06519, and the program RETOS ESP2014-57495-C2-1-R and ESP2016-80435-C2-2-R

Funders :

SNSF - Swiss National Science Foundation [CH]
FCT - Fundação para a Ciência e a Tecnologia [PT]
FEDER - Fonds Européen de Développement Régional [BE]
MINECO - Gobierno de Espana. Ministerio de Economia y Competitividad [ES]

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