 ![Comparison to data from [@HallEtal00]. Top: internal energy of the [@HallEtal00] protoplanets against time. Middle: purple, orange and cyan lines mark core luminosity against time for different rates of pebble accretion driven core growth. The intersection of these lines with the yellow lines marks the point at which core luminosity dominates over the rate of internal energy decrease for 00, 00, 00 and 00 percent of the [@HallEtal00] protoplanets. Bottom: histogram of final core masses in cases where the energy release during core formation was greater then the total energy of the protoplanet after only 0000 years.[]{data-label="fig:Cass"}](F/0000_cass_