Reviving the stalled shock by jittering jets in core collapse supernovae: jets from the standing accretion shock instability

TL;DR

This paper proposes that the spiral SASI in core collapse supernovae creates alternating angular momentum flows that amplify magnetic fields and launch jittering jets, which revive the stalled shock and drive the explosion, suggesting a paradigm shift to jet-driven models.

Contribution

It introduces a novel jet-driven explosion mechanism in CCSNe driven by SASI-induced alternating shear flows, emphasizing magnetic field amplification and jet jittering.

Findings

Alternating shear flows can amplify magnetic fields similarly to Keplerian disks.

Jittering jets can locally revive the stalled shock in supernovae.

Neutrino heating aids in energizing the jets.

Abstract

I present a scenario by which an accretion flow with alternating angular momentum sense on to a newly born neutron star in core collapse supernovae (CCSNe) efficiently amplifies magnetic fields and by that launches jets. The accretion flow of a collapsing core on to the newly born neutron star suffers the spiral standing accretion shock instability (SASI). This instability leads to a stochastically variable angular momentum of the accreted gas, that in turn forms an accretion flow with alternating directions of the angular momentum, hence alternating shear, at any given time. I study the shear in this alternating-shear sub-Keplerian inflow in published simulations, and present a new comparison with Keplerian accretion disks. From that comparison I argue that it might be as efficient as Keplerian accretion disks in amplifying magnetic fields by a dynamo. I suggest that although the average specific angular momentum of the accretion flow is small, namely, sub-Keplerian, this alternating-shear accretion flow can launch jets with varying directions, namely, jittering jets. Neutrino heating is an important ingredients in further energizing the jets. The jittering jets locally revive the stalled accretion shock in the momentarily polar directions, and by that they explode the star. I repeat again my call for a paradigm shift from a neutrino-driven explosion of CCSNe to a jet-driven explosion mechanism that is aided by neutrino heating.