Issue |
A&A
Volume 670, February 2023
|
|
---|---|---|
Article Number | A65 | |
Number of page(s) | 16 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202245396 | |
Published online | 08 February 2023 |
Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry
1
LESIA, Observatoire de Paris, Université PSL, CNRS,
5 Place Jules Janssen,
92190
Meudon, France
e-mail: florian.philipot@obspm.fr
2
Univ. Grenoble Alpes, CNRS, IPAG,
38000
Grenoble, France
3
Pixyl S.A.,
La Tronche, France
Received:
7
November
2022
Accepted:
19
December
2022
Context. Thanks to more than 20 yr of monitoring, the radial velocity (RV) method has detected long-period companions (P > 10 yr) around several dozens of stars. Yet, the true nature of these companions remains unclear because of the uncertainty as to the inclination of the companion orbital plane.
Aims. We wish to constrain the orbital inclination and the true mass of long-period single companions.
Methods. We used a Markov chain Monte Carlo (MCMC) fitting algorithm to combine RV measurements with absolute astrometry and, when available, relative astrometry data.
Results. We have lifted the sin(i) indetermination for seven long-period companions. We find true masses in the planetary mass range for the candidate planets detected in the following systems: Epsilon Indi A, HD 13931, HD 115954, and HD 222155. The mass of HD 219077 b is close to the deuterium-burning limit and its nature is uncertain because of the imprecise mass of the host star. Using additional RV measurements, we refine the orbital parameters of HIP 70849 b and find a mass in the planetary range. By combining RV data with absolute and relative astrometry, we significantly improve the characterization of HD 211847 B and properly determine its mass, which appears to be in the low-mass star range. This work illustrates how Gaia and HIPPARCOS allow for the orbital properties and masses of long-period RV companions to be further constrained.
Key words: techniques: radial velocities / techniques: high angular resolution / proper motions / planetary systems / brown dwarfs / stars: low-mass
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model.
Open Access funding provided by Max Planck Society.
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