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Koh Takahashi

助教/Assistant Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

Japan

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Research Interests

Astrophysics

100%

Astronomy

90%

Stellar Kinematics

80%

Neutron Star Physics

70%

Star Formation

60%

Extragalactic Astronomy

50%

Supernova Studies

30%

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Articles21

Inhomogeneous Stellar Mixing in the Final Hours before the Cassiopeia A Supernova

Article Link

Year:

2025

Destratification in the Progenitor Interior of the Mg-rich Supernova Remnant N49B

Article Link

Year:

2025

RAMBO. I. Project Introduction and First Results with uGMRT

Article Link

Year:

2025

Standing torsional Alfvén waves as the source of the rotational period variation in magnetic early-type stars

Article Link

Year:

2025

EMPRESS. XIII. Chemical Enrichment of Young Galaxies Near and Far at z ∼ 0 and 4–10: Fe/O, Ar/O, S/O, and N/O Measurements with a Comparison of Chemical Evolution Models

Article Link

Year:

2024

Variety of disc wind-driven explosions in massive rotating stars

Article Link

Year:

2024

Diagnosis of Circumstellar Matter Structure in Interaction-powered Supernovae with Hydrogen Line Features

Article Link

Year:

2024

Low [O/Fe] Ratio in a Luminous Galaxy at the Early Cosmic Epoch (z > 10): Signature of Short Delay Time or Bright Hypernovae/Pair-instability Supernovae?

Article Link

Year:

2024

Strong He i Emission Lines in High N/O Galaxies at z ∼ 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?

Article Link

Year:

2024

Monotonicity of the Cores of Massive Stars

Article Link

Year:

2023

Evolution and explosions of metal-enriched supermassive stars: proton rich general relativistic instability supernovae

Article Link

Year:

2023

Stability analysis of supermassive primordial stars: a new mass range for general relativistic instability supernovae

Article Link

Year:

2022

Stellar Models of Betelgeuse Constrained Using Observed Surface Conditions

Article Link

Year:

2022

Pulsations of primordial supermassive stars induced by a general relativistic instability; visible to JWST at z &gt; 12

Article Link

Year:

2022

A three-dimensional hydrodynamics simulation of oxygen-shell burning in the final evolution of a fast-rotating massive star

Article Link

Year:

2021

Ultra-delayed Neutrino-driven Explosion of Rotating Massive-star Collapse

Article Link

Year:

2021

Three-dimensional Hydrodynamics Simulations of Precollapse Shell Burning in the Si- and O-rich Layers

Article Link

Year:

2021

Modeling of magneto-rotational stellar evolution

Article Link

Year:

2021

Pulsational Pair-instability and the Mass Gap of Population III Black Holes: Effects of Overshooting

Article Link

Year:

2020

Fitting formulae for evolution tracks of massive stars under extreme metal-poor environments for population synthesis calculations and star cluster simulations

Article Link

Year:

2020

Matter Mixing in Aspherical Core-collapse Supernovae: Three-dimensional Simulations with Single-star and Binary Merger Progenitor Models for SN 1987A

Article Link

Year:

2020

Collaborators12

Miho N. Ishigaki

助教/Assistant Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

JAPAN

Kimihiko Nakajima

特任助教/Project Assistant Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

JAPAN

Ken’ichi Nomoto

JAPAN

Nozomu Tominaga

Professor

National Astronomical Observatory of Japan

JAPAN

Tomoya Takiwaki

准教授/Associate Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

JAPAN

Toshiki Sato

Assistant Professor

Ritsumeikan University

JAPAN

Takashi Yoshida

Research Assistant Professor

Kyoto University

JAPAN

Akihiro Suzuki

特任助教/Project Assistant Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

JAPAN

Haruka Sakemi

Kagoshima University

JAPAN

Yuichiro Sekiguchi

Toho University

JAPAN

Yuki Takei

Kyoto University

JAPAN

Daichi Kashino

Designated Assistant Professor

Nagoya University

JAPAN

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Koh Takahashi

助教/Assistant Professor

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Research Interests

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Articles21

Inhomogeneous Stellar Mixing in the Final Hours before the Cassiopeia A Supernova

Destratification in the Progenitor Interior of the Mg-rich Supernova Remnant N49B

RAMBO. I. Project Introduction and First Results with uGMRT

Standing torsional Alfvén waves as the source of the rotational period variation in magnetic early-type stars

EMPRESS. XIII. Chemical Enrichment of Young Galaxies Near and Far at z ∼ 0 and 4–10: Fe/O, Ar/O, S/O, and N/O Measurements with a Comparison of Chemical Evolution Models

Variety of disc wind-driven explosions in massive rotating stars

Diagnosis of Circumstellar Matter Structure in Interaction-powered Supernovae with Hydrogen Line Features

Low [O/Fe] Ratio in a Luminous Galaxy at the Early Cosmic Epoch (z > 10): Signature of Short Delay Time or Bright Hypernovae/Pair-instability Supernovae?

Strong He i Emission Lines in High N/O Galaxies at z ∼ 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?

Monotonicity of the Cores of Massive Stars

Evolution and explosions of metal-enriched supermassive stars: proton rich general relativistic instability supernovae

Stability analysis of supermassive primordial stars: a new mass range for general relativistic instability supernovae

Stellar Models of Betelgeuse Constrained Using Observed Surface Conditions

Pulsations of primordial supermassive stars induced by a general relativistic instability; visible to JWST at z &amp;gt; 12

A three-dimensional hydrodynamics simulation of oxygen-shell burning in the final evolution of a fast-rotating massive star

Ultra-delayed Neutrino-driven Explosion of Rotating Massive-star Collapse

Three-dimensional Hydrodynamics Simulations of Precollapse Shell Burning in the Si- and O-rich Layers

Modeling of magneto-rotational stellar evolution

Pulsational Pair-instability and the Mass Gap of Population III Black Holes: Effects of Overshooting

Fitting formulae for evolution tracks of massive stars under extreme metal-poor environments for population synthesis calculations and star cluster simulations

Matter Mixing in Aspherical Core-collapse Supernovae: Three-dimensional Simulations with Single-star and Binary Merger Progenitor Models for SN 1987A

Collaborators12

Miho N. Ishigaki

Kimihiko Nakajima

Ken’ichi Nomoto

Nozomu Tominaga

Tomoya Takiwaki

Toshiki Sato

Takashi Yoshida

Akihiro Suzuki

Haruka Sakemi

Yuichiro Sekiguchi

Yuki Takei

Daichi Kashino

How do I reach out?

Pulsations of primordial supermassive stars induced by a general relativistic instability; visible to JWST at z > 12