Probing Rotation of Core-collapse Supernova with Concurrent Analysis of Gravitational Waves and Neutrinos

TL;DR

This study proposes a method to determine the rotation of a supernova's core by analyzing the timing of gravitational wave and neutrino signals, potentially confirming core rotation in nearby and distant supernovae.

Contribution

It introduces a novel approach combining GW and neutrino detection timings to probe supernova core rotation, enhancing understanding of explosion mechanisms.

Findings

High confidence in detecting lack of core rotation for nearby supernovae.

Approximately 90% success rate in confirming core rotation.

Potential to extend rotation detection to more distant supernovae.

Abstract

The next time a core-collapse supernova (SN) explodes in our galaxy, vari- ous detectors will be ready and waiting to detect its emissions of gravitational waves (GWs) and neutrinos. Current numerical simulations have successfully introduced multi-dimensional effects to produce exploding SN models, but thus far the explosion mechanism is not well understood. In this paper, we focus on an investigation of progenitor core rotation via comparison of the start time of GW emission and that of the neutronization burst. The GW and neutrino de- tectors are assumed to be, respectively, the KAGRA detector and a co-located gadolinium-loaded water Cherenkov detector, either EGADS or GADZOOKS!. Our detection simulation studies show that for a nearby supernova (0.2 kpc) we can confirm the lack of core rotation close to 100% of the time, and the presence of core rotation about 90% of the time. Using this approach there is also po- tential to confirm rotation for considerably more distant Milky Way supernova explosions.