Constraining the properties of HD 206893 B: A combination of radial velocity, direct imaging, and astrometry data
- Grandjean, A.
- Lagrange, A.-M.
- Beust, H.
- Rodet, L.
- Milli, J.
- Rubini, P.
- Babusiaux, C.
- Meunier, N.
- Delorme, P.
- Aigrain, S.
- Zicher, N.
- Bonnefoy, M.
- Biller, B. A.
- Baudino, J.-L.
- Bonavita, M.
- Boccaletti, A.
- Cheetham, A.
- Girard, J. H.
- Hagelberg, J.
- Janson, M.
- Lannier, J.
- Lazzoni, C.
- Ligi, R.
- Maire, A.-L.
- Mesa, D.
- Perrot, C.
- Rouan, D.
- Zurlo, A.
DOIAbstract
International audienceContext. High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from the observed relative astrometry and the estimation of model and age-dependent masses from their observed magnitudes or spectra. Combining astrometric positions with radial velocity gives direct constraints on the orbit and on the dynamical masses of companions. A brown dwarf was discovered with the VLT/SPHERE instrument at the Very Large Telescope (VLT) in 2017, which orbits at ∼11 au around HD 206893. Its mass was estimated between 12 and 50 MJ from evolutionary models and its photometry. However, given the significant uncertainty on the age of the system and the peculiar spectrophotom...
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