open access

https://hdl.handle.net/2115/34718

Deep Impact mission unveils the interior structure of a comet and the origin of the solar system

日本語

2008-03-31

北海道大学低温科学研究所

Low Temperature Science

66

97-105

3章 惑星における氷の物理と化学

Deep Impact mission conducted an artificial impact experiment to investigate the interior of comet 9P/Tempel 1, a short-period comet. This article reviews the results of this mission and discuss their implications for the origin and early evolution of both comets and the Solar System. Major results of the mission are as follows. (1) Materials excavated from the interior of comet 9P/Tempel 1 are similar to those in long-period comets. (2) The excavated materials contain anhydrous minerals that have experienced high temperatures (＞1000 K). (3) The surface of comet 9P/Tempel 1 near the impact point has a surface layer several ten cm in thickness and containing submicron carbon particles. These findings indicate that long-and short-period comets may have been formed in similar locations, that the solar nebula may have had a high radial mixing efficiency, and that comet 9P/Temple 1 may have a very old surface layer that was formed when it was still in the outer peripheral region of the Solar System.

紀要論文

Version of Record

1880-7593