Protoearth mass shedding and the origin of the moon

Details Protoearth mass shedding and the origin of the moon Protoearth mass shedding and the origin of the moon

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..330b&link_type=abstract

Icarus (ISSN 0019-1035), vol. 66, May 1986, p. 330-340.

Physics

9

Earth-Moon System, Lunar Evolution, Planetary Mass, Protoplanets, Accretion Disks, Earth Mantle, Earth Rotation, Fission, Hydrodynamic Equations, Mass Flow

Scientific paper

Darwin's (1980) theory of lunar formation from the earth by means of a rotationally driven dynamic fission instability is presently considered in view of viscous shear's maintenance of solid body rotation throughout the protoearth's accretion phase. Assuming the appropriateness of a polytropic account of the protoearth, it is unlikely that dynamic fission could have occurred; instantaneous spin-up following a giant impact would instead have led to mass shedding. The dynamical phenomenon of mass shedding is here explored on the basis of numerical models for a self-gravitating, axisymmetric, polytropic and dissipative protoearth. It is concluded that mass shedding from the protoearth mantle after a giant impact and explosion could have contributed substantial matter to a lunar disk.

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