The process by which a stalled outgoing shock in a collapsing stellar core regains sufficient energy to expel outer material. Neutrino heating and multidimensional flow can contribute, while dissociation and radiation drain energy. Collapse does not guarantee a successful ordinary supernova.
A nonradial instability of the stalled accretion shock and post-shock flow in a core-collapse supernova. It can amplify large-scale sloshing or spiral motion through feedback between advected perturbations and acoustic disturbances. It can seed asymmetries relevant to explosion and remnant recoil, but is not itself a unique complete explanation of every neutron-star natal kick.
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