575 citations · 3.7k across the 85 of their papers we have counts for
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Impacts of hydrogen envelope on supernova fallback and the resulting compact remnant masses
Kengo Shinoda, Yudai Suwa, Ryosuke Hirai +4
Fallback in core-collapse supernovae plays a central role in setting compact-remnant masses and may produce late-time emission. In hydrogen rich progenitors, the reverse shock aris…
Isolated Black Holes as Potential PeVatrons and Ultrahigh-energy Gamma-ray Sources
Shigeo S. Kimura, Kengo Tomida, Masato I. N. Kobayashi +2
The origin of PeV cosmic rays is a long-standing mystery, and ultrahigh-energy gamma-ray observations would play a crucial role in identifying it. Recently, LHAASO reported the dis…
Modeling Hadronic Gamma-ray Emissions from Solar Flares and Prospects for Detecting Non-thermal Signatures from Protostars
Shigeo S. Kimura, Shinsuke Takasao, Kengo Tomida
We investigate gamma-ray emission in the impulsive phase of solar flares and the detectability of non-thermal signatures from protostellar flares. Energetic solar flares emit high-…
Interaction of a Relativistic Magnetized Collisionless Shock with a Dense Clump
Sara Tomita, Yutaka Ohira, Shigeo S. Kimura +2
The interactions between a relativistic magnetized collisionless shock and dense clumps have been expected to play a crucial role on the magnetic field amplification and cosmic-ray…
Acceleration and Escape Processes of High-energy Particles in Turbulence inside Hot Accretion Flows
Shigeo S. Kimura, Kengo Tomida, Kohta Murase
We investigate acceleration and propagation processes of high-energy particles inside hot accretion flows. The magnetorotational instability (MRI) creates turbulence inside accreti…
Explicit-Implicit Scheme for Relativistic Radiation Hydrodynamics
Hiroyuki R. Takahashi, Ken Ohsuga, Yuichiro Sekiguchi +2
We propose an explicit-implicit scheme for numerically solving Special Relativistic Radiation Hydrodynamic (RRHD) equations, which ensures a conservation of total energy and moment…