10 papers
J-GEM near-infrared follow-up observations of the gravitational wave event S240422ed
Ichiro Takahashi, Tomoki Morokuma, Masaomi Tanaka +9
We report our near-infrared (NIR) follow-up observations of the gravitational wave (GW) event S240422ed using the Subaru Telescope/MOIRCS. S240422ed was initially classified as a b…
Neutrino pair annihilation driven jets from black-hole torus systems
Kyohei Kawaguchi, Sho Fujibayashi, Masaru Shibata
We perform axisymmetric general relativistic radiation-viscous hydrodynamics simulations of black hole (BH)-torus systems with full Boltzmann Monte-Carlo neutrino transport to inve…
Signatures of Exploding Supermassive PopIII Stars at High Redshift in JWST, EUCLID and Roman Space Telescope
Cédric Jockel, Kyohei Kawaguchi, Sho Fujibayashi +1
Recently discovered supermassive black holes with masses of at redshifts - in active galactic nuclei (AGN) pose severe challenges to our understandi…
Collapse of Rotating White Dwarfs and Multimessenger Signals
Takami Kuroda, Kyohei Kawaguchi, Masaru Shibata
We present results of numerical relativity simulations for the collapse of rotating magnetized white dwarfs (WDs) in three dimension, aiming at discussing the explosion dynamics an…
Black hole-accretion disk collision in general relativity: Axisymmetric simulations
Alan Tsz-Lok Lam, Masaru Shibata, Kyohei Kawaguchi +1
Motivated by recent discoveries of X-ray quasi-periodic eruptions, we revisit the collision of a black hole and an accretion disk. Assuming that they are orbiting a supermassive bl…
Viscous accretion and ejection from tori around black holes in general relativity
Masaru Shibata, Kyohei Kawaguchi, Alan Tsz-Lok Lam
We systematically perform long-term (millions of Schwarzschild time) axisymmetric viscous hydrodynamics simulations for tori around black holes in general relativity supposing the…