惑星間塵の研究の現状と課題

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We present the current status of the research for interplanetary dust particles, based on the results recently obtained by space missions for exploration of primitive bodies, i.e. Stardust and Deep-impact missions to comets, and HAYABUSA mission to asteroid. The comet missions have suggested the existence of grain materials produced in high (beyond 1,000 K) temperature region, which implies the presence of radial convection of grains in the proto-planetary nebula. On the other hand, the asteroid mission has revealed that the asteroid Itokawa has low mass density of 1.95 g/cm3, and consequently it suggests high interior porosity of about 40 %. This evidence suggests that the occurrence of catastrophic collisional disruption of mother bodies yielded the high porosity aggregates consisting of fragment debris, as well as a large amount of dust particles in interplanetary space.
2007-06-20