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Lanthanide Impact on the Infra-Red Spectra of Nebular Phase Kilonovae
Quentin Pognan, Kyohei Kawaguchi, Shinya Wanajo +3
Nebular phase kilonovae (KNe) have significant infra-red (IR) emission thought to be mostly forbidden emission lines from rapid neutron capture (r-process) species in neutron star…
Collapse of rotating very massive stellar cores leading to a black hole and a massive disk as a source of gravitational waves
Masaru Shibata, Sho Fujibayashi
We derive models of rotating very massive stellar cores with mass -- which are marginally stable to the pair-unstable collapse, assuming that the core is…
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…
Neutrino flavor instabilities in a binary neutron star merger remnant: Roles of a long-lived hypermassive neutron star
Hiroki Nagakura, Kohsuke Sumiyoshi, Sho Fujibayashi +2
Understanding the post-merger evolution of binary neutron star merger (BNSM) requires accurate modeling of neutrino transport and microphysics including neutrino flavor conversions…
Linking Analytic Light Curve Models to Physical Properties of Kilonovae
Ayari Kitamura, Kyohei Kawaguchi, Masaomi Tanaka +1
In binary neutron star mergers, lanthanide-rich dynamical ejecta and lanthanide-poor post-merger ejecta have been often linked to the red and blue kilonova emission, respectively.…
Self-consistent scenario for jet and stellar explosion in collapsar: General relativistic magnetohydrodynamics simulation with dynamo
Masaru Shibata, Sho Fujibayashi, Shinya Wanajo +3
A resistive magnetohydrodynamics simulation with a dynamo term is performed for modeling the collapsar in full general relativity. As an initial condition, a spinning black hole an…