Orbital inclination and mass of the exoplanet candidate Proxima c

Abstract

We analyse the orbital parameters of the exoplanet candidate Proxima c recently discovered by Damasso et al. (2020) using a combination of its spectroscopic orbital parameters and Gaia DR2 proper motion anomaly. We obtain an orbital inclination of $i=152\pm 14°$ for the prograde solution, corresponding to a planet mass of $m_c=12_{-5}^{+12}{M}_{\oplus }$, comparable to Uranus or Neptune. While the derived orbital parameters are too uncertain to predict accurately the position of the planet for a given epoch, we present a map of its probability of presence relatively to its parent star in the coming years.

4 pages, 3 figures, Letter accepted for publication in A&A Letter on 12 March 2020