Luminosity caused by planetesimal accretion as a function of radius in the planet discussed in Sect. 4 at 1.95 Myr, i.e., shortly after the planet has detached from the disk. The luminosity directly from the impact (violet dashed), from the settling to the core (green short dashed), and the sum of the two is shown (blue solid). These quantities belong to the left y-axis. The thin dotted black line is the enclosed mass in the protoplanet’s envelope (right y-axis).