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We find that convective regions of collapsing massive stellar cores possesssufficient stochastic angular momentum to form intermittent accretion disksaround the newly born neutron star (NS) or black hole (BH), as required by thejittering-jets model for core-collapse supernova (CCSN) explosions. To reachthis conclusion we derive an approximate expression for stochastic specificangular momentum in convection layers of stars, and using the mixing-lengththeory apply it to four stellar models at core-collapse epoch. In all models,evolved using the stellar evolution code MESA, the convective helium layer hassufficient angular momentum to form an accretion disk. The mass available fordisk formation around the NS or BH is 0.1-1.2Mo; stochastic accretion of thismass can form intermittent accretion disks that launch jets powerful enough toexplode the star according to the jittering-jets model. Our results imply thateven if no explosion occurs after accretion of the inner ~2-5Mo of the coreonto the NS or BH (the mass depends on the stellar model), accretion of outerlayers of the core will eventually lead to an energetic supernova explosion.

Triggering jet-driven explosions of core-collapse supernovae by accretion from convective regions