Discovery of a stellar companion to HD 131399A
Abstract
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.
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.
Methods: We recorded HARPS high resolution spectra in January 2017.
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.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- December 2017
- DOI:
- 10.1051/0004-6361/201730978
- Bibcode:
- 2017A&A...608L...9L
- Keywords:
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- techniques: radial velocities;
- planetary systems;
- binaries: close;
- stars: individual: HD 131399