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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Dr. Koh Takahashi is an Assistant Professor at the National Astronomical Observatory of Japan. His research focuses on the dynamics and chemical evolution of stellar phenomena, as evidenced by his recent publications on topics such as inhomogeneous stellar mixing in supernovae and the chemical enrichment of young galaxies. His work also explores the implications of observational data from facilities like JWST and uGMRT in understanding astrophysical processes over cosmic time.

Articles (21)

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2025

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2020

Collaborators (12)

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

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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

Kagoshima University

JAPAN

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Yuichiro Sekiguchi

Toho University

JAPAN

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Yuki Takei

Kyoto University

JAPAN

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Daichi Kashino

Designated Assistant Professor

Nagoya University

JAPAN

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Koh Takahashi

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Articles (21)

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

Collaborators (12)

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

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