| Issue |
A&A
Volume 633, January 2020
|
|
|---|---|---|
| Article Number | A44 | |
| Number of page(s) | 16 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201936038 | |
| Published online | 10 January 2020 | |
A HARPS RV search for planets around young nearby stars★
1
Univ. Grenoble Alpes, CNRS, IPAG,
38000
Grenoble,
France
e-mail: antoine.grandjean1@univ-grenoble-alpes.fr
2
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg,
Germany
3
CNRS Lesia (UMR8109) – Observatoire de Paris,
Paris,
France
4
INAF – Osservatorio Astronomico di Padova,
Vicolo dell’Osservatorio 5,
Padova
35122,
Italy
5
INAF – Osservatorio Astrofisico di Catania,
via Santa Sofia, 78
Catania,
Italy
6
European Southern Observatory (ESO), Alonso de Córdova 3107,
Vitacura,
Casilla
19001,
Santiago,
Chile
7
Departamento de Astronomía, Universidad de Chile, Camino al Observatorio,
Cerro Calán,
Santiago,
Chile
8
Oxford Astrophysics, Department of Physics,
Denys Wilkinson Building,
UK
Received:
6
June
2019
Accepted:
14
October
2019
Context. 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.
Aims. 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.
Methods. We used the HARPS spectrograph on the 3.6 m 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.
Results. We confirm the binary nature of HD 177171, HD 181321 and HD 186704. We report the detection of a close low mass stellar companion for HIP 36985. 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%.
Key words: techniques: radial velocities / stars: activity / binaries: spectroscopic / planetary systems / starspots / stars: variables: general
A table of the radial velocities is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/633/A44
© A. Grandjean et al. 2020
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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