演講資訊

摘要：

Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarfs and are among the primary producers of iron-group elements in the Universe. Despite their importance in stellar evolution and cosmology, the nature of their progenitor systems and explosion mechanisms remains uncertain. In particular, it is still unclear how isolated white dwarfs ignite and explode, with most proposed scenarios involving a stellar companion.

I will present our multi-wavelength study of nearby thermonuclear supernovae spanning gamma-ray to infrared wavelengths. Using long-term optical follow-up observations complemented by ultraviolet and infrared archival data, we investigate the temporal evolution of these explosions. To connect the observations with explosion mechanisms, we perform detailed numerical radiative transfer simulations and compare them directly with observed spectra and light curves. Our analysis provides evidence that at least a subset of thermonuclear supernovae originate from mergers of white dwarfs. We also find low energy explosions that are unable to unbind the entire white dwarf and produce a bound remnant object.

Finally, in preparation for the Vera C. Rubin Observatory era, I will present our ongoing work on an LSST alert-ingestion and rapid transient-diagnosis platform designed for efficient follow up of interesting transients discovered by LSST.