Daichi Hiramatsu

I am mainly interested in how massive stars die as explosive transients called supernovae. I use both observations and simulations of supernovae to extract their progenitor and explosion properties from the time series of photometry and spectroscopy. In particular, I would like to answer the key questions like, what are the progenitors doing in the final years before explosion, where is the lowest/highest progenitor-mass boundary that results in a supernova, what kind of compact objects do such extreme supernovae leave behind, and how much heavy elements do they produce and contribute to the chemical evolution of the Universe? Using the same set of techniques, I also study gravitational-wave events from the mergers of neutron stars and/or black holes, fast radio bursts from highly magnetized neutron stars, and tidal disruption events from stars torn apart by supermassive black holes.