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Pulsational pair-instability and the mass gap of Population III Black Holes: Effects of overshooting
Hideyuki Umeda, Takashi Yoshida, Chris Nagele +1
Since the discovery of GW190521, several proposals have been put forward to explain the formation of a black hole in the mass gap caused by (pulsational) pair-instability, $M = 65-…
Three-flavor collective neutrino conversions with multi-azimuthal-angle instability in an electron-capture supernova model
Masamichi Zaizen, Shunsaku Horiuchi, Tomoya Takiwaki +4
We investigate the multi-azimuthal angle (MAA) effect on collective neutrino oscillation by considering the three-dimensional neutrino momentum distribution in a realistic electron…
Population III Binary Black Holes: Effects of Convective Overshooting on Formation of GW190521
Ataru Tanikawa, Tomoya Kinugawa, Takashi Yoshida +2
GW190521 is a merger of two black holes (BHs), wherein at least one BH lies within the pair-instability (PI) mass gap, and it is difficult to form because of the effects of PI supe…
The Final Fate of Supermassive Pop III Stars: Explosion or Collapse?
Chris Nagele, Hideyuki Umeda, Koh Takahashi +2
We investigate the possibility of a supernova in supermassive () population III stars induced by a general relativistic instability occurring in the helium…
A Sub-Solar Metallicity Progenitor for Cassiopeia A, the remnant of a Type IIb Supernova
Toshiki Sato, Takashi Yoshida, Hideyuki Umeda +7
We report, for the first time, the detection of the Mn-K line in the Type IIb supernova (SN IIb) remnant, Cassiopeia A. Manganese (Mn after decay of Co), a neutron…
First Detection of X-Ray Line Emission from Type IIn Supernova 1978K with XMM-Newton's RGS
Y. Chiba, S. Katsuda, T. Yoshida +2
We report on robust measurements of elemental abundances of the Type IIn supernova SN 1978K, based on the high-resolution X-ray spectrum obtained with the Reflection Grating Spectr…