Accretion of Jupiter-mass Planets in the Limit of Vanishing Viscosity

Motivation: the rate of gas accretion by the giant planets is crucial to understand their mass distribution. Too fast runaway accretion leads to too massive planets. Method: we investigated the characteristics of the circumplanetary disc (CPD) of a Jupiter-mass planet with a three-dimensional hydrodynamical nested grid code. We looked for the accretion mechanisms operating in inviscid (MRI inactive) CPD. Main results: 1) the main accretion mechanism from the CPD to the planet is the stellar tide 2) Jupiter's accretion rate could be >10x slower than previously thought 3) runaway growth could happen on a timescale comparable to the disc's lifetime