Impact of binary interactions on the diffuse supernova neutrino background
ORAL · Invited
Abstract
Binary interactions, especially mass transfer and mergers, can strongly influence the evolution of massive stars and change their final properties and the occurrence of supernovae. Here, we investigate how binary interactions affect predictions of the diffuse flux of neutrinos. By performing stellar population syntheses including prescriptions for binary interactions, we show that the resulting detection rates of the diffuse supernova neutrino background is enhanced by 15%-20% compared to estimates without binary considerations. A source of significant uncertainty arises due to the presently sparse knowledge of the evolution of rapidly rotating carbon-oxygen cores, especially those created as a result of mergers near the white dwarf to core collapse boundary. The enhancement effect may be as small as a few percent if the effects of rotation in postmerger systems are neglected, or as large as 75% if trends are extrapolated. Our estimates serve to highlight that binary effects can be important.
*We acknowledge support from the University of Tokyo Young Excellent Researcher program. This work is supported by the U.S. Department of Energy Office of Science under award No. DE-SC0020262 and NSF Grants No.AST-1908960 and No.PHY-1914409 and by the Grants-in-Aid for the Scientific Research of Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number (JP17H05206, JP17K14306, JP17H01130, JP17H06364, JP18H01212, 22K03630) and by the Central Research Institute of Explosive Stellar Phenomena (REISEP) of Fukuoka University and the associated project (No. 207002), and by Joint Institute for Computational Fundamental Science (JICFuS) as ``Program for Promoting Researches on the Supercomputer Fugaku'' (Toward a unified view of the universe: from large scale structures to planets).
