TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 55 (No. 1), pp. 53-57, 2003

Modification of a proto-lunar disk by hydrodynamic escape of silicate vapor

Hidenori Genda and Yutaka Abe

Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

(Received April 3, 2002; Revised November 27, 2002; Accepted January 17, 2003)

Abstract: We have estimated a criterion for escape of silicate vapor from the disk formed by a giant impact. Escape from the disk affects the mass distribution and specific angular momentum of the disk. We applied the results to the disk formed by the Moon-forming impact. In the case of a hot (>6000 K) and highly vaporized (>63%) disk, the material outside of the Roche radius escapes. This indicates that the formation of the Moon is influenced by the thermal state of the disk just after the giant impact.

Corresponding author E-mail: genda@sys.eps.s.u-tokyo.ac.jp

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