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The origins of light and heavy r-process elements identified by chemical tagging of metal-poor stars
Takuji Tsujimoto, Toshikazu Shigeyama
Growing interests in neutron star (NS) mergers as the origin of r-process elements have sprouted since the discovery of evidence for the ejection of these elements from a short-dur…
Dynamical Evolution of an Ultra-relativistic Fireball Colliding with a Freely Expanding Gas
Akihiro Suzuki, Toshikazu Shigeyama
We investigate the hydrodynamical evolution of an ultra-relativistic fireball colliding with a freely expanding gas. The hydrodynamical interaction of the fireball and the gas resu…
Signatures of A Companion Star in Type Ia Supernovae
Keiichi Maeda, Masamichi Kutsuna, Toshikazu Shigeyama
While type Ia Supernovae (SNe Ia) have been used as precise cosmological distance indicators, their progenitor systems remain unresolved. One of the key questions is if there is a…
Enrichment history of r-process elements shaped by a merger of neutron star pairs
Takuji Tsujimoto, Toshikazu Shigeyama
The origin of r-process elements remains unidentified and still puzzles us. The recent discovery of evidence for the ejection of r-process elements from a short-duration gamma-ray…
Origin of Ne Emission Line of Very Luminous Soft X-ray Transient MAXI J0158744
Yukari Ohtani, Mikio Morii, Toshikazu Shigeyama
We investigate the mechanism to reproduce notable spectral features at the ignition phase of nova explosion observed for a super-Eddington X-ray transient source MAXI J0158744 i…
An Investigation into Surface Temperature Distributions of High-B Pulsars
Nobutoshi Yasutake, Kei Kotake, Masamichi Kutsuna +1
Bearing in mind the application to high-magnetic-field (high-B) radio pulsars, we investigate two-dimensional (2D) thermal evolutions of neutron stars (NSs). We pay particular atte…