Evolution of vortex properties for the showcase simulations presented in Sect. 3. The panels show, from top to bottom, the mass enclosed in the FWHM ellipse of the vortex fit M_vort in Jupiter masses, the radial location of the vortex r_vort, and its FWHM Δr, indicated by the shaded area, and the ratio between minimum vortensity inside the vortex and the azimuthal median of vortensity at the radial location of the vortensity minimum. A dotted vertical line indicates the time when the planet has reached its final mass. The curves are smoothed with a median filter that spans over the preceding and following five datapoints (± 50 orbits at r_p). The orange parts of the line in the bottom panel show the evolution of the vortensity prior to the “birth” and after the “death” of the vortex.