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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742601.0, MPI für Astronomie / Publikationen_mpia
Discovery of a stellar companion to HD 131399A
Authors:Lagrange, A. -. M.; Keppler, M.; Beust, H.; Rodet, L.; Meunier, N.; Lillo-Box, J.; Bonnefoy, M.; Galland, F.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Start Page:id. L9 (5 pp)
Audience:Not Specified
Abstract / Description:Context. The giant exoplanets imaged on wide orbits (≥10 au) around young stars challenge the classical theories of planet formation. The presence of perturbing bodies could have played a role in the dynamical evolution of the planets once formed. <BR /> Aims: We aim to search for close companions to HD 131399, a star around which a giant planet has been discovered, at a projected separation of about 80 au. The star also appears to be a member of a wide (320 au) binary system. <BR /> Methods: We recorded HARPS high resolution spectra in January 2017. <BR /> Results: We find that HD 131399A is probably seen close to pole-on. We discover a low mass star companion that orbits with a period of about 10 days on a misaligned orbit. Even though the companion does not have an impact on the current dynamical evolution of the planet, it could have played a role in its setting and in clearing the circumstellar disk from which the planet may originate. Based on data obtained with the ESO3.6 m/HARPS spectrograph at La Silla.
Free Keywords:techniques: radial velocities; planetary systems; binaries: close; stars: individual: HD 131399
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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