Effect of variable core density on the in situ formation and evolution of Jupiter. In each panel, red solid lines show the case of a variable core density, while blue dotted lines correspond to a constant core density of 3.2 g/cm³. The top left panel shows the core mass as a function of time during the formation phase; afterwards it is constant. The top right panel is the radius of the core. The local maximum for the variable density case occurs at about 1 Myr. The bottom left panel is the mean core density. The bottom right panel finally shows the total radius of the planet during the long-term evolution.