Volume 635, March 2020
|Number of page(s)||4|
|Section||Letters to the Editor|
|Published online||02 April 2020|
Letter to the Editor
Orbital inclination and mass of the exoplanet candidate Proxima c
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
2 GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, 92195 Meudon, France
3 LUTH, Observatoire de Paris, Université PSL, 5 Place Jules Janssen, 92195 Meudon, France
Accepted: 12 March 2020
We analyze the orbital parameters of the recently discovered exoplanet candidate Proxima c using a combination of its spectroscopic orbital parameters and Gaia DR2 astrometric proper motion anomaly. We obtain an orbital inclination of i = 152 ± 14 deg, corresponding to a planet mass of mc = 12−5+12 M⊕, comparable to Uranus and Neptune. While the derived orbital parameters are too uncertain to accurately predict the position of the planet for a given epoch, we present a map of its probability of presence relative to its parent star in the coming years.
Key words: astrometry / planetary systems / planets and satellites: individual: Proxima c / proper motions / celestial mechanics / planets and satellites: fundamental parameters
© P. Kervella et al. 2020
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