Electron-capture supernovae within super-AGB wind and SN 1054 (Crab Nebula)

Lunch Colloquium
Dr. Takashi Moriya

Massive stars are known to explode as SNe because of the central core collapse. Stars with the ZAMS mass above around 10 Msun trigger the core collapse after the formation of an Fe core. However, it has been suggested that massive stars whose mass is slightly smaller than the mass required to form the Fe core can still make an electron-degenerate O+Ne+Mg core which can trigger core collapse through the electron-capture reactions. This kind of SNe are called electron-capture SNe. The stars which explode as electron-capture SNe are super-AGB stars at the time of the explosions. Since super-AGB stars experience large mass loss, electron-capture SN explosions occur within dense circumstellar media which affect the observational properties of the SNe. We performed numerical radiation hydrodynamics calculation to predict the light curve properties of electron-capture SNe exploded within super-AGB wind. We compare our results to observaed SN light curves, focusing on the historical light curve of SN 1054, which is currently known as Crab Nebula and has been suggested to be an electron-capture SN.