An illustrative diagram of the time evolution of an 85 M\(_\odot\) resulting in a core-collapse supernova. The diagram comprises four distinct time steps (going clockwise).
In each figure, the left panel shows specific entropy per baryon; the right panel displays the velocity dispersion as an approximate for turbulent convective motion \(\delta v_r\).
Pink-hatched regions show zones that are buoyantly stable and susceptible to quadrupolar oscillations. Yellow/black dotted areas depict overshooting regions.
Convective plumes, and other asymetric fluid motions penetrate these regions, albeit at different times and to varying extents.
These transport energy into the g-mode region, causing it to oscillate and emit gravitational waves at a characteristic mode frequency.