Observing Supernova Neutrino Light Curves with Super-Kamiokande. VI. A Practical Data Analysis Technique Considering Realistic Experimental Backgrounds
Year: 2025
Type: article
Abstract: Neutrinos from supernovae, especially those emitted during the late phase of core collapse, are essential for understanding the final stages of massive star evolution. We have been dedicated to developing methods for the analysis of neutrinos emitted during the late phase and observed at Super-Kamiokande (SK). Our previous studies have successfully demonstrated the potential of various analysis methods in extracting essential physical properties; however, the lack of background consideration has limited their practical application. In this study, we address this issue by incorporating a realistic treatment of the experimental signal and background events with the on-going SK experiment. We therefore optimize our analysis framework to reflect realistic observational conditions, including both signal and background events. Using this framework we study several long-time supernova models, simulating the late phase neutrino observation in SK and focusing in particular on the identification of the last observed event. We discuss the possibility of model discrimination methods using timing information from this last observed event.
Source: The Astrophysical Journal
Institutions: Okayama University, Kyushu University, Institute for Cosmic Ray Research, Kamioka Observatory, The University of Tokyo, Kavli Institute for the Physics and Mathematics of the Universe, Waseda University, Tohoku University, RIKEN, Ibaraki National College of Technology, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences, National Institute of Technology, Numazu College, National Astronomical Observatory of Japan, Kyoto University, Yukawa Institute for Theoretical Physics
Language: English
Topic: Neutrino Physics Research
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Awards: Study of non-spherical core-collapse supernovae by the first principle calculation and nuclear physics, The fate of massive stars explored by the first principle calculations in general relativity with nuclear physics, G2684844751, Comprehensive study on formation process of neutron stars: dense nuclear matter and neutrino emission, G433906749, The last moments of binary massive-star evolution and their explosive phenomena, Gravitational collapse of ONeMg white dwarfs and associated transient high-energy phenomena, Exploration of the neutron star formation processes by the first-principle type supernova simulations, G7597215507, G7899650636, A supernova view on evolution of massive stars in the final decade: synergy between rapid spectroscopic observations and comprehensive theory
OpenAlex ID: W4414788376