The CORALIE survey for southern extrasolar planets: XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation

Binaries: visual; Planetary systems; Planets and satellites: detection; Techniques: radial velocities; Direct imaging; Doppler measurement; Long-term trend; Main sequence stars; Orbital parameters; Planet search; Radial velocity; Southern Hemisphere; Astronomy and Astrophysics; Space and Planetary Science

Abstract :

[en] Context. Since 1998, a planet-search around main sequence stars within 50 pc in the southern hemisphere has been underway with the CORALIE spectrograph at La Silla Observatory. Aims. With an observing time span of more than 20 yr, the CORALIE survey is able to detect long-term trends in data with masses and separations large enough to select ideal targets for direct imaging. Detecting these giant companion candidates will allow us to start bridging the gap between radial-velocity-detected exoplanets and directly imaged planets and brown dwarfs. Methods. Long-term precise Doppler measurements with the CORALIE spectrograph reveal radial-velocity signatures of massive planetary companions and brown dwarfs on long-period orbits. Results. In this paper, we report the discovery of new companions orbiting HD 181234, HD 13724, HD 25015, HD 92987 and HD 50499. We also report updated orbital parameters for HD 50499b, HD 92788b and HD 98649b. In addition, we confirm the recent detection of HD 92788c. The newly reported companions span a period range of 15.6-40.4 yr and a mass domain of 2.93-26.77 MJup, the latter of which straddles the nominal boundary between planets and brown dwarfs. Conclusions. We report the detection of five new companions and updated parameters of four known extrasolar planets. We identify at least some of these companions to be promising candidates for imaging and further characterisation.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Rickman, E.L.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Ségransan, D.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Marmier, M.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Udry, S.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Bouchy, F.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Lovis, C.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Mayor, M.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Pepe, F.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Queloz, D.; Département d'Astronomie, Université de Genève, Versoix, Switzerland

Santos, N.C.; Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, Caup, Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade Do Porto, Porto, Portugal

More authors (29 more)

Language :

English

Title :

The CORALIE survey for southern extrasolar planets: XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation

Publication date :

May 2019

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

625

Issue :

A71

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.aanda.org/10.1051/0004-6361/201935356/pdf

Funding text :

Acknowledgements. This work has been carried out within the framework of the National Centre for Competence in Research PlanetS supported by the Swiss National Science Foundation. The authors acknowledge the financial support of the SNSF. This publication makes use of the Data & Analysis Center for Exoplanets (DACE), which is a facility based at the University of Geneva (CH) dedicated to extrasolar planets data visualisation, exchange and analysis. DACE is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, federating the Swiss expertise in Exoplanet research. The DACE platform is available at https://dace.unige.ch. L.A.dS. and J.V.S. acknowledge the support from the European Research Council (ERC) under the European Union\u2019s Horizon 2020 research and innovation programme (project FOUR ACES, grant agreement No 724427). N.C.S. was supported by FCT \u2013 Funda\u00E7\u00E3o para a Ci\u00EAncia e a Tecnologia \u2013 through national funds and by FEDER through COMPETE2020 \u2013 Programa Operacional Competitividade e Internacionaliza\u00E7\u00E3o by these grants: UID/FIS/04434/2013 & POCI-01-0145-FEDER-007672; PTDC/FIS-AST/28953/2017 & POCI-01-0145-FEDER-028953 and PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER-032113. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/ gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

Commentary :

18 pages, 11 figures, accepted to A&A

Available on ORBi :

since 07 March 2025

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