Seiji Sugita / Professor / Division of Transdisciplinary Sciences
Department of Complexity Science and Engineering/ Macroscopic complexity sysem/ Astrobiology, Planetary Science, Hypervelocity Impacts

Career Summary
1992: Master of Science, Department of Earth and Planetary Science, The University of Tokyo
1998: PhD., Brown University (Graduation, May 1999)
1998-1999: Postdoctoral Research Associate, Brown University
1999-2003: Faculty Research Associate, The University of Tokyo
1999-2000: National Research Council fellowship at NASA Ames Research Center
2004-2009 : Associate Professor, The University of Tokyo
2009- Professor, The University of Tokyo
Educational Activities
Graduate School: Analyses of Complexity in Earth and Planets, Foundations of Comparative Planetary Science,
Undergraduate School: Foundations of Comparative Planetary Science, Special Exercise in Earth and Planetary Physics
Research Activities
We are studying the origin and evolution of the Earth and planets. In particular, we are interested in the physical and chemical processes in hypervelocity impacts.

1) Kadono, T., S. Sugita, S. Sako, T. Ootsubo, M. Honda, H. Kawakita, T. Miyata, R. Furusho, and J. Watanabe, Thickness and formation age of surface layer on Comet 9P/Tempel 1, Astrophys. J., 661, L89-L92, 2007.
2) Schultz, P. H., S. Sugita, C. A. Eberhardy, and C. M. Ernst, The role of ricochet impact on impact vaporization. Int. J. Impact Eng., 33, 771-780, 2006.
3) Sugita, S., T. Ootsubo, T. Kadono, M. Honda, S. Sako, T. Miyata, Sakon, T. Yamashita, H. Kawakita, H. Fujiwara, T. Fujiyoshi, N. Takato, T. Fuse, J. Watanabe, R. Furusho, S. Hasegawa, T. Kasuga, T. Sekiguchi, D. Kinoshita, K. J. Meech, D. H. Wooden, W. H. Ip, M. F. A'Hearn, Subaru telescope observations of deep impact, Science, 310, 274-278, 2005.
Other Activities
The Japanese Society for Planetary Sciences
American Geophysical Union (AGU)
Future Plan
Our laboratory has a series of high-speed impact systems, ranging from 50 m/s to 6 km/s. We also simulate impact-induced high-temperature vaporization processes using high-energy laser irradiation experiments. The thermodynamic conditions of laser-produced vapor clouds approximate those of impact-induced vapor clouds at 30-100 km/s of impact velocity. Using these facilities, we are studying the physical and chemical processes occurring within high-temperature vapor clouds and their effects on the origin and evolution of the Earth and planets.
Messages to Students
We welcome all students interested in planets and the history of the Earth. Although our primary emphasis is experimental laboratory research, graduate students in our laboratory have pursued different research approaches, such as theoretical calculation and astronomical observation. The is wealth of possibilities for research topics on planets and the history of Earth means that new graduate students are encouraged to come up with their own thesis topics for research in our laboratory. Although choosing a graduate topic that is both interesting and feasible can be challenging, it is probably the most important and exciting task in research.