HARPS radial velocity search for planets in the Scorpius-Centaurus association: A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys

Article


Grandjean, A., Lagrange, A.M., Meunier, N., Chauvin, G., Borgniet, S., Desidera, S., Galland, F., Kiefer, F., Messina, S., Iglesias, D., Nicholson, B., Pantoja, B., Rubini, P., Sedaghati, E., Sterzik, M. and Zicher, N.. 2023. "HARPS radial velocity search for planets in the Scorpius-Centaurus association: A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys." Astronomy and Astrophysics: a European journal. 669. https://doi.org/10.1051/0004-6361/202141235
Article Title

HARPS radial velocity search for planets in the Scorpius-Centaurus association: A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys

ERA Journal ID1050
Article CategoryArticle
AuthorsGrandjean, A., Lagrange, A.M., Meunier, N., Chauvin, G., Borgniet, S., Desidera, S., Galland, F., Kiefer, F., Messina, S., Iglesias, D., Nicholson, B., Pantoja, B., Rubini, P., Sedaghati, E., Sterzik, M. and Zicher, N.
Journal TitleAstronomy and Astrophysics: a European journal
Journal Citation669
Article NumberA12
Number of Pages23
Year2023
PublisherEDP Sciences
ISSN0004-6361
1432-0746
Digital Object Identifier (DOI)https://doi.org/10.1051/0004-6361/202141235
Web Address (URL)https://www.aanda.org/articles/aa/abs/2023/01/aa41235-21/aa41235-21.html
Abstract

Context. The Scorpius-Centaurus (Sco-Cen) young and nearby massive star-forming region is particularly well suited for extrasolar planet searches with both direct imaging and radial velocity (RV) techniques. The RV search, however, is challenging, as the stars are faster rotators on average than their older stellar counterparts of similar spectral types. Moreover, the RV time series show strong signatures of stellar variability (spots and faculae) and/or stellar pulsations.

Aims. Our aim is to search for giant planets (GPs) and brown dwarfs at short orbital distances around star members of the Sco-Cen association. We also aim at using these data together with others available on young stars to estimate the GP occurrence rate for young stars for periods of up to 1000 days.

Methods. We used the High Accuracy Radial velocity Planet Searcher (HARPS) spectrograph on the 3.6 m telescope at the La Silla Observatory to monitor 88 A – F Sco-Cen stars. To improve our statistics and analysis, we combined this survey with two previous surveys that focused on young nearby stars (YNS) to compute companion occurrence rates from a sample of 176 young A – M stars.

Results. We report the discovery of a massive hot-Jupiter candidate around HD 145467, together with the discovery of one probable short-period (P < 10 days) brown dwarf around HD 149790. In addition, we confirm the binary nature of eight single-line binaries: HD 108857, HD 108904, HD 111102, HD 114319, HD 121176, HD 126488, HD 126838, and HD 133574. From our sample, we obtain a GP (mc ∈ [1; 13] MJup) occurrence rate of 0.7−0.2+1.6% for periods between 1 and 1000 days and a brown dwarf (mc ∈ [13; 80] MJup) occurrence rate of 0.6−0.2+1.4%, in the same period range. In addition, we report a possible lack of close (P ∈ [1; 1000] days) GPs around young F-K stars compared to their older counterparts, with a confidence level of 95%.

KeywordsBinaries: spectroscopic; techniques: radial velocities; stars: activity ; planetary systems; starspots ; stars: variables: general
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Byline AffiliationsGrenoble Alpes University, France
University of Paris, France
Paris Observatory, France
Astronomical Observatory of Padova, Italy
Catania Astrophysical Observatory, Italy
University of Leeds, United Kingdom
University of Oxford, United Kingdom
Centre for Astrophysics
University of Chile, Chile
Pixyl, France
European Southern Observatory, Chile
European Southern Observatory, Germany
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