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Multi-Messenger Tests for Fast-Spinning Newborn Pulsars Embedded in Stripped-Envelope Supernovae
Kazumi Kashiyama, Kohta Murase, Imre Bartos +2
Fast-spinning strongly magnetized newborn neutron stars, including nascent magnetars, are popularly implemented as the engine of luminous stellar explosions. Here, we consider the…
X-raying extended emission and rapid decay of short gamma-ray bursts
Yasuaki Kagawa, Daisuke Yonetoku, Tatsuya Sawano +5
Extended emission is a mystery in short gamma-ray bursts (SGRBs). By making time resolved spectral analyses of brightest nine events observed by XRT, we obviously cla…
Fast Luminous Blue Transients from Newborn Black Holes
Kazumi Kashiyama, Eliot Quataert
Newborn black holes in collapsing massive stars can be accompanied by a fallback disk. The accretion rate is typically super-Eddington and strong disk outflows are expected. Such o…
Direct collapse black hole formation via high-velocity collisions of protogalaxies
Kohei Inayoshi, Eli Visbal, Kazumi Kashiyama
We propose high-velocity collisions of protogalaxies as a new pathway to form supermassive stars (SMSs) with masses of ~ 10^5 Msun at high redshift (z > 10). When protogalaxies hos…