Imperfect Equilibration of Hf-W System by Giant Impacts

Hf-W chronometry provides constraints on the timing of planetary accretion and differentiation, as segregation of a metal core from silicates should induce strong fractionation... 

Imperfect Equilibration of Hf-W System by Giant Impacts

Subaru Infrared Spectroscopy of the Pluto

Several previous observations of Pluto in the J, H, and K bands have derived its surface composition of mixture ice of N2, CH4, and CO. Hydrocarbons generally have a fundamental... 

Subaru Infrared Spectroscopy of the Pluto

Subaru Infrared Spectroscopy of the Asteroid Karin

“Space weathering” is the term applied to darkening albedo, reddening spectral slope, and obscuring absorption bands of planetary surface materials with time. The... 

Subaru Infrared Spectroscopy of the Asteroid Karin

Recent Publications

Takanori Sasaki & Yutaka Abe, Hydrodynamic Escape of Early Venusian Atmosphere, Planetary People, 17, 117-122 (2008).

Takanori Sasaki & Yutaka Abe, Rayleigh-Taylor Instability after Giant Impacts: Imperfect equilibration of Hf-W system and its effect on the core formation age, EPS, 59, 1035-1045 (2007).

Takanori Sasaki, Ai Kanno, Masateru Ishiguro, Daisuke Kinoshita & Ryosuke Nakamura, Search for nonmethane hydrocarbons on Pluto, ApJ, 618, L57-L60 (2005).

Takanori Sasaki, Sho Sasaki, Jun-ichi Watanabe, Tomohiko Sekiguchi, Fumi Yoshida, Hideyo Kawakita, Tetsuharu Fuse, Naruhisa Takato, Budi Dermawan & Takashi Ito, Mature and fresh surfaces on the new-born asteroid Karin, ApJ, 615, L161-L164 (2004).

other publications

Recent Posts

Numerical Experiments on Variation of Species Diversity

Numerical Experiments on Variation of Species Diversity

In this study, on the basis of the assumption of “random-way” and “size-dependent-chosen” evolution, we reconsider an evolving food web model and discuss the mechanism of diversification, stabilization, and extinction of species. By adopting the size-dependent evolutionary system, we derived a particular evolutionary pattern of the diversity that maintained equilibrated state over the long [...]

Imperfect Equilibration of Hf-W System by Giant Impacts

Imperfect Equilibration of Hf-W System by Giant Impacts

Hf-W chronometry provides constraints on the timing of planetary accretion and differentiation, as segregation of a metal core from silicates should induce strong fractionation of Hf from W. In previous studies, it was assumed that a giant impact raise up perfect resetting on Hf-W chronometer. In this study, we showed the difficulty of [...]

Subaru Infrared Spectroscopy of the Pluto

Subaru Infrared Spectroscopy of the Pluto

Several previous observations of Pluto in the J, H, and K bands have derived its surface composition of mixture ice of N2, CH4, and CO. Hydrocarbons generally have a fundamental C-H stretching mode in the L band (2.8 - 4.0 um), the absorption of which is much stronger than the overtones in the J, [...]

Subaru Infrared Spectroscopy of the Asteroid Karin

Subaru Infrared Spectroscopy of the Asteroid Karin

“Space weathering” is the term applied to darkening albedo, reddening spectral slope, and obscuring absorption bands of planetary surface materials with time. The mismatch between reflectance spectra of most common asteroids (S-type asteroids) and most common meteorites (ordinary chondrites) might be caused by the space weathering. Recent laboratory experiments simulating micrometeorite impact heating [...]

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