Extreme pebble accretion in ringed protoplanetary discs

ABSTRACT Axisymmetric dust rings containing tens to hundreds of Earth masses solids have been observed in protoplanetary discs with (sub-)millimetre imaging. Here, we investigate the growth a planetary embryo massive (150 M⊕) axisymmetric trap through and gas hydrodynamics simulations. When accounting for accretion luminosity from pebble accretion, thermal feedback on surrounding leads formation an anticyclonic vortex. Since vortex forms at location planet, this has significant consequences planet’s growth: as drifts towards pressure maximum centre vortex, which is initially co-located rapid rate achieved, distinct phase ‘vortex-assisted’ accretion. Once separates planet due interactions disc, it accumulates dust, shutting off planet. We find that mediated by results ≈100 M⊕ solids. follow evolution well efficiency grains accumulate its function their size, morphology disc. speculate extreme scenario may be origin giant planets are identified significantly enhanced heavy elements.