ECCENTRICITY AND INCLINATION EVOLUTION OF HOT PROTOPLANETARY EMBRYOS IN PROTOPLANETARY DISCS

After a very brief review of the literature on planet-disc tidal interactions, we focus on planetary embryos that are heated by planetesimal bombardment or pebble accretion. They irradiate the surrounding disc and thereby induce temperature and density perturbation in their neighbourhood, in addition to the disturbances triggered by gravity. In return, the perturbation of density induces a force on the embryo. Through an analysis in the linear regime and through numerical simulations, we investigate the impact of this force on the eccentricity and inclination of hot embryos. Instead of the consistent decay that these orbital elements suffer when the embryo does not release heat, we find here that they are on the contrary excited to values comparable with the aspect ratio of the disc.