Planetary core formation via multispecies pebble accretion

ABSTRACT In the general classical picture of pebble-based core growth, planetary cores grow by accretion single pebble species. The growing planet may reach so-called isolation mass, at which it induces a pressure bump that blocks inward drifting pebbles exterior to its orbit, thereby stalling growth accretion. recent hydrodynamic simulations, filtration depends on several parameters including disc structure, turbulent viscosity and size. We have investigated how multiple, instead single, species affects rates, dependence mass size sets final masses. performed numerical simulations in viscous one-dimensional disc, where maximal grain sizes were regulated fragmentation drift limits. confirm rates masses are sensitive three key parameters: threshold velocity fragment collision, distribution species, yield diversity cores. With multiple can very fast, reaching over 30–40 ME mass. Potential cold gas giants able form from embryos initially implanted as far 50 au. Our results suggest multispecies could explain: estimated 25–45 heavy element abundance inside Jupiter’s core; massive extrasolar planets; rings gaps wider orbits; early rapid formation bodies.