Identifying rotation in SASI-dominated core-collapse supernovae with a neutrino gyroscope

Understand

Measuring the rotation of core-collapse supernovae (SN) and of their progenitor stars is extremely challenging.

• Here it is demonstrated that neutrinos may potentially be employed as stellar gyroscopes, if phases of activity by the standing accretion-shock instability (SASI) affect the neutrino emission prior to the onset of the SN explosion.
• This is shown by comparing the neutrino emission properties of self-consistent, three-dimensional (3D) SN simulations of a 15 M_sun progenitor without rotation as well as slow and fast rotation compatible with observational constraints.
• The explosion of the fast rotating model gives rise to long-lasting, massive polar accretion downflows with stochastic time-variability, detectable e.g.