My main research target is a "supernova", which is a violent explosion at the end of a massive star evolution. Many mysteries still remain: What kind of stars explode? How do stars explode? I am working on "pre-supernova (pre-SN) neutrinos" in order to solve the former mystery. Pre-SN neutrinos are emitted at the central parts of a star prior to a supernova and have important roles in a stellar evolution and supernova explosion. We will get the information about a stellar interior directly, which will impose some constraints on a stellar evolution. Moreover, the detection of pre-SN neutrinos is an alarm for the subsequent supernova explosion and also contribute to deepen our understanding of an explosion mechanism.
Neutrinos also have important roles for a supernova explosion. They give an energy to matter during propagating outwards and help an explosion. We call them "supernova neutrinos". I investigate how many times neutrinos interact with matter and how much energy is given to matter.