A dynamical mass for GJ 463 b: A massive super-Jupiter companion beyond the snow line of a nearby M dwarf

Abstract

We determined the full orbital architecture and true mass of the recently Doppler-detected long-period giant planet GJ 463 b using the Hipparcos-Gaia proper motion anomaly in combination with the available radial velocities, constraints from the knowledge of the spectroscopic orbital parameters, and supplementary information from a sensitivity analysis of Gaia Data Release 3 astrometry. We determined an orbital inclination ib = 152+2 -3 deg (for a prograde orbit) and a mass ratio q = 0:0070 ± 0:0007, corresponding to a true mass of the companion Mb = 3:6 ± 0:4 MJup. True mass determinations for a super-Jupiter companion at intermediate orbital separations beyond the snow line around low-mass stars (M∗ = 0:5 M ) are a rare occurrence. Its existence is possibly explained in the context of disk-instability models of planet formation.