Characterizing a supernova's Standing Accretion Shock Instability with neutrinos and gravitational waves

Understand

We perform a novel multi-messenger analysis for the identification and parameter estimation of the Standing Accretion Shock Instability (SASI) in a core collapse supernova with neutrino and gravitational wave (GW) signals.

• In the neutrino channel, this method performs a likelihood ratio test for the presence of SASI in the frequency domain.
• For gravitational wave signals we process an event with a modified constrained likelihood method.
• Using simulated supernova signals, the properties of the Hyper-Kamiokande neutrino detector, and O3 LIGO Interferometric data, we produce the two-dimensional probability density function (PDF) of the SASI activity indicator and calculate the probability of detection $P_\mathrm{D}$ as well as the false identification probability $P_\mathrm{FI}$.