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Chief Scientist Laboratories Astrophysical Big Bang Laboratory

Chief Scientist: Shigehiro Nagataki (Ph.D.)

Research Summary

Shigehiro  Nagataki(Ph.D.)

Our laboratory, Astrophysical Big Bang Laboratory, was established on 1st Apr. 2013. Our group focuses on unveiling lots of mysteries surrounding astrophysical explosive phenomena such as supernovae (SNe) and gamma-ray bursts (GRBs). SNe and GRBs are the most powerful explosions in the universe, and yet very little are known about their explosion mechanisms. These astrophysical big bangs continue to fascinate us with their unknown physics and puzzling astronomical phenomena such as gravitational waves, r-process nucleosynthesis, particle acceleration, high-energy gamma-rays/neutrinos, ultra high-energy cosmic rays. Through our theoretical and computational approaches, we strive to reveal the complete pictures of these violent explosions and provide the-state-of-the-art physical interpretations for current, cutting-edge observations as well as useful predictions for future observations by the next-generation astronomical observatories. We are more than passionate to co-operate with researchers in RIKEN as well as all other interested groups in Japan and the world, and together we would like to establish a Utopia in RIKEN for scientists.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Informatics
  • Theoretical Astrophysics
  • Astroparticle Physics
  • Nuclear Astronomy


  • Supernovae
  • Gamma-Ray Bursts
  • Black Holes
  • Neutron Stars
  • Cosmic Rays

Selected Publications

  • 1. Ferrand Gilles, Tanikawa Ataru, Warren Donald C., Nagataki Shigehiro, Safi-Harb Samar, Decourchelle Anne:
    "The double detonation of a double degenerate system, from Type Ia supernova explosion to its supernova remnant"
    The Astrophysical Journal, 930, id.92 (2022)
  • 2. S. Orlando, A. Wongwathanarat, H.-T. Janka, M. Miceli, S. Nagataki, M. Ono, F. Bocchino, J. Vink, D. Milisavljevic, D. J. Patnaude, and G. Peres:
    "Evidence for past interaction with an asymmetric circumstellar shell in the young SNR Cassiopeia A"
    Astronomy & Astrophysics, Vol. 666, article id. A2 (2022)
  • 3. Yong-Jia Huang, Luca Baiotti, Toru Kojo, Kentaro Takami, Hajime Sotani, Hajime Togashi, Tetsuo Hatsuda, Shigehiro Nagataki, and Yi-Zhong Fan:
    "Merger and post-merger of binary neutron stars with a quark-hadron crossover equation of state"
    Phys. Rev. Lett. 129, 181101 (2022)
  • 4. A. Dohi, N. Nishimura, H. Sotani, T. Noda, H.-L. Liu, S. Nagataki & M. Hashimoto:
    "Impacts of the direct URCA and Superfluidity inside a Neutron Star on Type-I X-Ray Bursts and X-Ray Superbursts"
    The Astrophysical Journal 937 124 (2022)
  • 5. Tyler Parsotan, Hirotaka Ito:
    "GRB Prompt Emission: Observed Correlations and Their Interpretations"
    Universe, Vol. 8, issue 6, p. 310, (2022)
  • 6. Sato T., Maeda K., Nagataki S., Yoshida T., Grefenstette B., Williams B. J., Umeda H., Ono M., Hughes J. P.:
    "High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection"
    Nature, Volume 592, Issue 7855, p.537-540 (2021)
  • 7. Just O., Goriely S., Janka H. -Th, Nagataki S., Bauswein A.:
    "Neutrino absorption and other physics dependencies in neutrino-cooled black hole accretion discs"
    Monthly Notices of the Royal Astronomical Society, Volume 509, Issue 1, pp.1377-1412 (2022)
  • 8. Ito H., Just O., Takei Y., Nagataki S.:
    "A Global Numerical Model of the Prompt Emission in Short Gamma-ray Bursts"
    The Astrophysical Journal, Volume 918, Issue 2, id.59, 12 pp. (2021)
  • 9. Warren D. C., Dainotti M., Barkov M. V., Ahlgren B., Ito H., Nagataki S.:
    "A Semianalytic Afterglow with Thermal Electrons and Synchrotron Self-Compton Emission"
    The Astrophysical Journal, Volume 924, Issue 1, id.40, 16 pp. (2022)
  • 10. Dohi A., Nishimura N., Hashimoto M., Matsuo Y., Noda T., Nagataki S.:
    "Effects of the Nuclear Equation of State on Type I X-Ray Bursts: Interpretation of the X-Ray Bursts from GS 1826-24"
    The Astrophysical Journal, Volume 923, Issue 1, id.64, 16 pp. (2021)

Recent Research Results



Annual research report

Related Links

Lab Members

Principal investigator

Shigehiro Nagataki
Chief Scientist

Core members

Akira Mizuta
Research Scientist
Eiji Kido
Research Scientist
Hajime Sotani
Research Scientist
Nobuya Nishimura
Research Scientist
Yuta Sekino
Postdoctoral Researcher
Ryo Higuchi
Special Postdoctoral Researcher
Akira Dohi
Special Postdoctoral Researcher
Takatoshi Ko
Junior Research Associate
Haoning He
Visiting Scientist
Oliver Just
Visiting Scientist
Maxim Barkov
Visiting Scientist
Yohei Kawazura
Visiting Scientist
Noemie Globus
Visiting Scientist
Atsushi Tamii
Visiting Scientist
Jirong Mao
Visiting Scientist
Masaomi Ono
Visiting Scientist
Yuki Takei
Visiting Scientist
Sudipta Hensh
Visiting Scientist

Contact Information

S217 Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: shigehiro.nagataki [at] riken.jp