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Diversity of Type Ia Supernovae Imprinted in Chemical Abundances
Takuji Tsujimoto, Toshikazu Shigeyama
A time delay of Type Ia supernova (SN Ia) explosions hinders the imprint of their nucleosynthesis on stellar abundances. However, some occasional cases give birth to stars that avo…
Feedback effects of aspherical supernovae explosions on galaxies
Kenji Bekki, Toshikazu Shigeyama, Takuji Tsujimoto
We investigate how explosions of aspherical supernovae (A-SNe) can influence star formation histories and chemical evolution of dwarf galaxies by using a new chemodynamical model.…
Type-Ia Supernova Remnant Shell At Seen In The Three Sightlines Toward The Gravitationally Lensed Qso B1422+231
Satoshi Hamano, Naoto Kobayashi, Sohei Kondo +3
Using the Subaru 8.2m Telescope with an IRCS Echelle spectrograph, we obtained high-resolution (R=10,000) near-infrared (1.01-1.38 μm) spectra of images A and B of the gravitationa…
Early evolution of spherical ejecta expanding into the circumstellar matter at ultra-relativistic speeds
Toshikazu Shigeyama, Akihiro Suzuki, Ko Nakamura
We present a new self-similar solution describing early evolution of an ultra-relativistic flow resulting from a collision of homologously expanding spherical ejecta with the circu…
Effects of magnetic fields on the propagation of nuclear flames in magnetic white dwarfs
Masamichi Kutsuna, Toshikazu Shigeyama
We investigate effects of the magnetic field on the propagation of laminar flames of nuclear reactions taking place in white dwarfs (WDs) with the mass close to the Chandrasekhar l…