H
Hideyuki Umeda
Researcher at University of Tokyo
Publications - 223
Citations - 16386
Hideyuki Umeda is an academic researcher from University of Tokyo. The author has contributed to research in topics: Supernova & Stars. The author has an hindex of 52, co-authored 212 publications receiving 15054 citations.
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Journal ArticleDOI
An Unusual Supernova in the Error Box of the Gamma-Ray Burst of 25 April 1998
Titus Galama,P. M. Vreeswijk,J. van Paradijs,J. van Paradijs,Chryssa Kouveliotou,Chryssa Kouveliotou,T. Augusteijn,H. Böhnhardt,J. Brewer,V. Doublier,J.-F. Gonzalez,Bruno Leibundgut,C. Lidman,Olivier Hainaut,Ferdinando Patat,John Heise,J. J. M. in 't Zand,Kevin Hurley,Paul J. Groot,Richard G. Strom,Paolo A. Mazzali,Koichi Iwamoto,Ken'ichi Nomoto,Hideyuki Umeda,Takahisa Nakamura,T. R. Young,Tsutomu Suzuki,Toshikazu Shigeyama,Thomas M. Koshut,Marc Kippen,Marc Kippen,C. R. Robinson,C. R. Robinson,P. de Wildt,Ralph A. M. J. Wijers,Nial R. Tanvir,Jochen Greiner,Elena Pian,E. Palazzi,F. Frontera,N. Masetti,Luciano Nicastro,M. Feroci,Enrico Costa,L. Piro,Bruce A. Peterson,C. G. Tinney,B. J. Boyle,Russell D. Cannon,R. A. Stathakis,Elaine M. Sadler,Michael C. Begam,Philip A. Ianna +52 more
TL;DR: In this paper, the authors reported the discovery of transient optical emission in the error box of the gamma-ray burst GRB980425, the light curve of which was very different from that of previous optical afterglows associated with Gamma-ray bursts.
Journal ArticleDOI
Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
Koichi Iwamoto,F. Brachwitz,Ken'ichi Nomoto,N. Kishimoto,Hideyuki Umeda,W. Raphael Hix,Friedrich-Karl Thielemann,Friedrich-Karl Thielemann +7 more
TL;DR: In this paper, the authors calculate explosive nucleosynthesis in relatively slow deflagrations with a variety of deflagration speeds and ignition densities to put new constraints on the above key quantities.
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Galactic Chemical Evolution: Carbon through Zinc
TL;DR: In this article, the authors calculate the evolution of heavy-element abundances from C to Zn in the solar neighborhood, adopting their new nucleosynthesis yields for wide ranges of metallicity (Z = 0-Z☉) and the explosion energy (normal supernovae and hypernovae).
Journal ArticleDOI
Nucleosynthesis yields of core-collapse supernovae and hypernovae, and galactic chemical evolution
TL;DR: In this article, the authors present new nucleosynthesis yields as functions of the stellar mass, metallicity, and explosion energy (corresponding to normal supernovae and hypernovae), and apply the results to the chemical evolution of the solar neighborhood.
Journal ArticleDOI
A hypernova model for the supernova associated with the gamma ray burst of 25 April 1998
Koichi Iwamoto,Paolo A. Mazzali,Ken'ichi Nomoto,Hideyuki Umeda,Takahisa Nakamura,Ferdinando Patat,I. J. Danziger,T. R. Young,Tsutomu Suzuki,Toshikazu Shigeyama,T. Augusteijn,V. Doublier,J.-F. Gonzalez,H. Boehnhardt,J. Brewer,Olivier Hainaut,Christopher Lidman,Bruno Leibundgut,Enrico Cappellaro,Massimo Turatto,Titus Galama,P. M. Vreeswijk,Chryssa Kouveliotou,J. van Paradijs,J. van Paradijs,Elena Pian,E. Palazzi,Filippo Frontera +27 more
TL;DR: The discovery of the unusual supernova SN1998bw, and its possible association with the γ-ray burst GRB 9804251,2,3, provide new insights into the explosion mechanism of very massive stars and the origin of some classes of gamma-ray bursts.