A HARPS RV search for planets around young nearby stars
| Autor: | Miriam Keppler, A. Grandjean, L. Mignon, Michael Sterzik, G. Chauvin, B. Pantoja, L. Rodet, N. Zicher, Anne-Marie Lagrange, F. Galland, Silvano Desidera, N. Meunier, S. Messina, S. Borgniet |
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| Přispěvatelé: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
FOS: Physical sciences
Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Planet 0103 physical sciences Agency (sociology) techniques: radial velocities stars: activity Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics planetary systems Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics Earth and Planetary Astrophysics (astro-ph.EP) [PHYS]Physics [physics] 010308 nuclear & particles physics Starspot Astronomy Astronomy and Astrophysics Planetary system stars: variables: general Stars starspots Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Christian ministry Astrophysics::Earth and Planetary Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] binaries: spectroscopic Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 633, pp.A44. ⟨10.1051/0004-6361/201936038⟩ |
| ISSN: | 0004-6361 |
| Popis: | Young nearby stars are good candidates in the search for planets with both radial velocity (RV) and direct imaging techniques. This, in turn, allows for the computation of the giant planet occurrence rates at all separations. The RV search around young stars is a challenge as they are generally faster rotators than older stars of similar spectral types and they exhibit signatures of magnetic activity (spots) or pulsation in their RV time series. Specific analyses are necessary to characterize, and possibly correct for, this activity. Our aim is to search for planets around young nearby stars and to estimate the giant planet (GP) occurrence rates for periods up to 1000 days. We used the HARPS spectrograph on the 3.6m telescope at La Silla Observatory to observe 89 A-M young (< 600 Myr) stars. We used our SAFIR (Spectroscopic data via Analysis of the Fourier Interspectrum Radial velocities ) software to compute the RV and other spectroscopic observables. Then, we computed the companion occurrence rates on this sample. We confirm the binary nature of HD177171, HD181321 and HD186704. We report the detection of a close low mass stellar companion for HIP36985. No planetary companion was detected. We obtain upper limits on the GP (< 13 MJup) and BD (13-80 MJup) occurrence rates based on 83 young stars for periods less than 1000 days, which are set, 2_-2^+3 % and 1_-1^+3 %. 19 pages, 15 figures |
| Databáze: | OpenAIRE |
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