Characterizing a supernova's standing accretion shock instability with neutrinos and gravitational waves
Abstract
We perform a novel multimessenger 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 PD as well as the false identification probability PFI. We discuss the probability to establish the presence of the SASI as a function of the source distance in each observational channel, as well as jointly. Compared to a single-messenger approach, the joint analysis results in a PD (at PFI=0.1 ) of SASI activities that is larger by up to ≈40 % for a distance to the supernova of 5 kpc. We also discuss how accurately the frequency and duration of the SASI activity can be estimated in each channel separately. Our methodology is suitable for implementation in a realistic data analysis and a multimessenger setting.
- Publication:
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Physical Review D
- Pub Date:
- April 2023
- DOI:
- arXiv:
- arXiv:2211.07878
- Bibcode:
- 2023PhRvD.107h3017L
- Keywords:
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- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 24 pages, 15 figures, accepted by PRD