KOZASA Takashi

J-GLOBAL         Last updated: Feb 10, 2018 at 09:41
KOZASA Takashi
Hokkaido University
Faculty of Science, Department of Natural History Sciences
Job title
Doctor of Science(Kyoto University), Master of Science(Kyoto University)
Other affiliation
Hokkaido University


Astrophysics; Formation of dust in the ejecta of supernovae, and in the stellar wind of AGB stars.
Dust destruction by shock in supernova remnants and in interstellar medium. Origin and evolution of dust in galaxies. Exploration of astrophysical phenomena related with dust.

Research Areas


Academic & Professional Experience

Research Fellow, Faculty of Science,
Kyoto University
Research Fellow, Institute
of Cosmic Ray Research, University of Tokyo
Research Fellow, Faculty of Science,


Physics, Graduate School, Division of Natural Science, Kyoto University
Physics, Faculty of Science, Kyoto University

Published Papers

Dust formation and mass loss around intermediate-mass AGB stars with initial metallicity Zini ≤ 10-4 in the early Universe - I. Effect of surface opacity on stellar evolution and the dust-driven wind
Tashibu, Shohei; Yasuda, Yuki; Kozasa, Takashi
Monthly Notices of the Royal Astronomical Society   466(2) 1709-1732   Apr 2017   [Refereed]
Sakon, I.; Sako, S.; Oanaka, T.; Nozawa, T.; Kimura, Y.; Fujiyoshi, T.; Shimonishi, T.; Usui, F.; Takahashi, H.; Ohsawa, R.; Arai, A.; Uemura, M.; Nagayama, T.; Koo, B.-C.; Kozasa, T.
Journal of Physics: Conference Series   728(6) 062006(1)-062006(4)   Jul 2016
Sakon, Itsuki; Sako, Shigeyuki; Onaka, Takashi; Nozawa, Takaya; Kimura, Yuki; Fujiyoshi, Takuya; Shimonishi, Takashi; Usui, Fumihiko; Takahashi, Hidenori; Ohsawa, Ryou; Arai, Akira; Uemura, Makoto; Nagayama, Takahiro; Koo, Bon-Chul; Kozasa, Takashi
The Astrophysical Journal   817(2) 145(1)-145(23)   Feb 2016   [Refereed]
Nozawa, Takaya; Wakita, Shigeru; Hasegawa, Yasuhiro; Kozasa, Takashi
The Astrophysical Journal   811(2) L39(1)-L39(5)   Oct 2015   [Refereed]
Dust Production Factories in the Early Universe: Formation of Carbon Grains in Red-supergiant Winds of Very Massive Population III Stars
Nozawa, Takaya; Yoon, Sung-Chul; Maeda, Keiichi; Kozasa, Takashi; Nomoto, Ken'ichi; Langer, Norbert
The Astrophysical Journal   787(2) L17(1)-L17(5)   Jun 2014   [Refereed]
Nozawa, Takaya; Kozasa, Takashi
The Astrophysical Journal   776(1) 24(1)-24(17)   Oct 2013   [Refereed]
Properties of Newly Formed Dust Grains in the Luminous Type IIn Supernova 2010jl
Maeda, K.; Nozawa, T.; Sahu, D. K.; Minowa, Y.; Motohara, K.; Ueno, I.; Folatelli, G.; Pyo, T.-S.; Kitagawa, Y.; Kawabata, K. S.; Anupama, G. C.; Kozasa, T.; Moriya, T. J.; Yamanaka, M.; Nomoto, K.; Bersten, M.; Quimby, R.; Iye, M.
The Astrophysical Journal   776(1) 5(1)-5(16)   Oct 2013   [Refereed]
Isensee, Karl; Olmschenk, Greg; Rudnick, Lawrence; DeLaney, Tracey; Rho, Jeonghee; Smith, J. D.; Reach, William T.; Kozasa, Takashi; Gomez, Haley
The Astrophysical Journal   757(2) 126(1)-126(12)   Oct 2012   [Refereed]
Nozawa, Takaya; Kozasa, Takashi; Nomoto, Ken'ichi
The Astrophysical Journal Letters   756(2) L35(1)-L35(5)   Sep 2012   [Refereed]
Multi-Epoch Observations of Dust Formed around WR140
Sakon, I.; Ohsawa, R.; Asano, K.; Mori, T. I.; Onaka, T.; Nozawa, T.; Kozasa, T.; Fujiyoshi, T.
ASP Conference Series   458 139-140   Aug 2012


Simultaneous Formation of Presolar SiC and TiC Grains
Proc. the 34th ISAS Lunar and Planet. Symp.   34 164-166   2001
Simultaneous Formation of Presolar SiC and TiC Grains
Proc. the 34th ISAS Lunar and Planet. Symp.   34 164-166   2001
Heterogeneous Condensation of Presolar Core-Mantle Grains: Formation Conditions of Presolar TiC Core-Graphite Mantle Grain in Carbon Star Envelopes
Proc. the 33rd.ISAS Lunar and Planct. Symp.   33 111-114   2000
The Optical Properties of Olivine : Bulk Optical Constants and Absorption Spectra of Small Particle
Proc. the 32nd ISAS Lunar and Planet.Symp.   32 179-182   1999
Heterogeneous Condensation of Presolar Care Mantle Grains
Proc. the 32nd ISAS Lunar and Planet.Symp.   32 117-120   1999
The rate of steady nucleation involving chemical reactions
Proc. the 31st ISAS Lunch and Planetary Science Symp.   31 184-187   1998
The Nature of Dust Grains around Oxygen-rich AGB Stars
Sogawa, H.; Kozasa, T.
Pulsating Stars: Recent Developments in Theory and Observation, Edited by M. Takeuti and D. D. Sasselov. Frontiers Series No. 23, Published by Universal Academic Press   215   1998
Origin of presolar grains : Formation of TiC core-graphitic spherules in carbon rich AGB stars
Proc. the 29th Annual Lunar and Planetary Science Conference   29 1366   1998
Formation conditions of presolar TiC core-graphite mantle spherules in the Murchison meteorite(jointly worked)
Proc. 30th ISAS Lunar and Planetary Symp.   30 119   1997
Crystallization of amorphous silicate in cometary dust
Proc. ISAS 29th Lunar and Planetary Symp   29 252   1996
Formation of SiC grains in circumstellar envelopes of carbon stars(jointly worked)
Proc. ISAS 28th Lunar and Planet. Symp   28 177   1995
The nature of cometany dust deduced from the 10μm fractal(jointly worked)
Proc. 27th ISAS Lunar. Planet. Symp.   27 178   1994
Physical properties of cometany nuclei I : tcnsile strength(jointly worked)
Proc. 27th ISAS Lunar and Planet. Symp.   27 170   1994
Conditions for condensation and preservation of water ice and crystallinity of astrophysical ices(jointly worked)
Proc. 26th ISAS Lunar. Planet. Symp.   26 124   1993
Heterogeneous condensation of water ice in space(jointly worked)
Proc. 25th ISAS Lunar Planet. Symp.   25 268   1992
Analysis of the cometany spectra by the 2-componeut fractal dust model. (jointly worked)
Proc. 25th ISAS Lunar Planet. Symp.   25 249   1992
Optical properties of dust aggregates(jointly worked)
Proc. 25th ISAS Lunar. Planet. Symp.   25 243   1992
Chondrule formation by Planetecosmal-Planeterimal collisions (II) : Formations of relic minerals(jointly worked)
Proc. 23rd ISAS Lunar Planet. Symp.   23 219   1990
A thermal process and its cmplication for the contents of carbon and nitrogen in carbonaceous chondrites(jointly worked)
Proc. 22nd ISAS Lunar Planet. Symp.   22 309   1989
Formation of dust grains in the ejecta of SN1987A II : Comparison with the observations(jointly worked)
Proc. 22nd ISAS Lunar Planet. Symp.   22 239   1989
Evaporation and recondensation of grains in the primordial solar nebula(jointly worked)
Proc. 22nd ISAS Lunar Planet. Symp.   22 236   1989
Chondrule formation by planetesimal-planetesimal collisions(jointly worked)
Proc. 21st ISAS. Lunar Planet. Symp.   22 136   1989
Formation of dust grains in the eject of SN1987A(jointly worked)
Proc. 21st ISAS Lunar. Planet. Symp.   21 166   1988
On the relation of carbon and nitrogen contents in carbonaceous chondrites(jointly worked)
Proc. 21st ISAS Lunar Planet. Symp.   21 120   1988
Condensation of Ultra-refractory metals(jointly worked)
Proc. 20th ISAS Lunar. Planet. Symp.   20 99   1987
Cometany nucleus as aggregates of Planetesimals(jointly worked)
Proc. 20th ISAS Lunar Planet. Symp.   20 57   1987
Morphology of cometany nucleus(jointly worked)
Proc. 19th ISAS Lunar Planer. Symp.   19 71   1986
The formation of iron grains in the primordial solar nebula(jointly worked)
Proc. 17th ISAS Lunar Planet. Symp.   17 50   1984
Nucleation process in dissociated gas(jointly worked)
Proc. 16th ISAS Lunar. Planet. Symp.   16 126   1983
Nucleation process in very low density gas ; Can iron atoms condense into metallic iron(jointly worked)
Proc. 16th ISAS Lunar. Planet. Symp.   16 122   1983

Research Grants & Projects

Stellar evolution and chemical enrichment from the first starts to the Milkey Way
Project Year: Apr 2011 - Mar 2016    Investigator(s): AOKI Wako
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2008 - 2011    Investigator(s): Takashi KOZASA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(S))
Project Year: 2006 - 2010    Investigator(s): Masayuki FUJIMOTO
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(若手研究(B))
Project Year: 2007 - 2009    Investigator(s): Takaya NOZAWA
We investigated the formation of dust in the ejecta of supernovae that are considered to be sources of interstellar dust in the early universe. Then we studied the evolution of the newly formed dust in the shocked gas within the supernova remnants...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2004 - 2006    Investigator(s): Takashi KOZASA
The results of researches carried out during the period of the projects are the followings;1.The extinction curves and the infrared emissions from dust in young galaxies were calculated and compared with the observations, in the context of dust fo...