A belt of moonlets in Saturn's A ring.

A belt of moonlets in Saturn's A ring. Research Abstract Details 

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A belt of moonlets in Saturn's A ring. Abstract Text:

Miodrag Sremcevi?, Schmidt,Heikki Salo,Martin Seiss,Frank Spahn,Nicole Albers,

The origin and evolution of planetary rings is one of the prominent unsolved problems of planetary sciences, with direct implications for planet-forming processes in pre-planetary disks. The recent detection of four propeller-shaped features in Saturn's A ring proved the presence of large boulder-sized moonlets in the rings. Their existence favours ring creation in a catastrophic disruption of an icy satellite rather than a co-genetic origin with Saturn, because bodies of this size are unlikely to have accreted inside the rings. Here we report the detection of eight new propeller features in an image sequence that covers the complete A ring, indicating embedded moonlets with radii between 30 m and 70 m. We show that the moonlets found are concentrated in a narrow 3,000-km-wide annulus 130,000 km from Saturn. Compared to the main population of ring particles (radius s < 10 m), such embedded moonlets have a short lifetime with respect to meteoroid impacts. Therefore, they are probably the remnants of a shattered ring-moon of Pan size or larger, locally contributing new material to the older ring. This supports the theory of catastrophic ring creation in a collisional cascade.

A belt of moonlets in Saturn's A ring. Publishing Authors By Initials

M Sremcevi?,J Schmidt,H Salo,M Seiss,F Spahn,N Albers,

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A belt of moonlets in Saturn's A ring. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Nature

VOLUME: 449

Page Numbers: 1019-21

Journal Abbreviation: Nature

ISSN: 1476-4687

DAY: 25

MONTH: Oct

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 410462

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Grant and Affiliation Information for A belt of moonlets in Saturn's A ring.

AFFILIATION: Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, 392 UCB, Boulder, Colorado 80309-0392, USA. miodrag.sremcevic@lasp.colorado.edu

Country: England

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MEDLINETA: Nature

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