Origin of the gap between planetary ring and satellite systems, and the size and structure of the ring particles

Details Origin of the gap between planetary ring and satellite systems, and the size and structure of the ring particles Origin of the gap between planetary ring and satellite systems, and the size and structure of the ring particles

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..628g&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Aug. 1985, p. 628-633) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, July-Aug

Astronomy and Astrophysics

Astronomy

6

Celestial Mechanics, Natural Satellites, Particle Size Distribution, Planetary Rings, Density Distribution, Erosion, Particle Collisions, Radii, Tides

Scientific paper

Contary to the traditional view, the exterior radius Re of a planet's primary (stable, large-body) ring system and the size of the largest member particles are determined not by tidal forces but by a more efficient mechanism: erosion of the particle surfaces through grazing collisions in the differential rotating disk. In the zone where R is less than about Re these impacts will give the fine fragments velocities preventing return to the parent bodies; hence objects in the rings can grow by accretion only to a radius of 10 m. The observed sizes of Saturn's ring particles imply a specific energy of 10 erg/cu cm of surface erosion, indicating that the larger bodies should be coated with a friable layer of particulates and dust.

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