Boosting jittering jets by neutrino heating in core collapse supernovae

TL;DR

This paper estimates that neutrino heating roughly doubles the energy of jets in core collapse supernovae, supporting a stochastic jet explosion mechanism involving multiple jittering jets.

Contribution

It introduces a model where neutrino heating significantly enhances jet energy, bolstering the jittering jets explosion mechanism in CCSNe.

Findings

Neutrino heating roughly doubles jet energy in CCSNe.

Jittering jets with multiple episodes drive most explosions.

High-pressure gas expands and does work on the jet cocoon.

Abstract

I estimate the energy that neutrino heating adds to the outflow that jets induce in the collapsing core material in core collapse supernovae (CCSNe), and find that this energy crudely doubles the energy that the jets deposit into the outer core. I consider the jittering jets explosion mechanism where there are several stochastic jet-launching episodes, each lasting for about 0.01-0.1 seconds. The collapsing core material passes through the stalled shock at about 100 km and then slowly flows onto the proto-neutron star (NS). I assume that the proto-NS launches jittering jets, and that the jets break out from the stalled shock. I examine the boosting process by which the high-pressure gas inside the stalled shock, the gain region material, expands alongside the jets and does work on the material that the jets shock, the cocoon. This work is crudely equal to the energy that the original jets carry. I argue that the coupling between instabilities, stochastic rotation, magnetic fields, and jittering jets lead to most CCSN explosions. In other cases, the pre-collapse core is rapidly rotating and therefore ordered rotation replaces stochastic rotation and fixed jets replace jittering jets.