Black Rain: The Burial of Callisto and Ganymede in Irregular Satellite Debris

Details Black Rain: The Burial of Callisto and Ganymede in Irregular Satellite Debris Black Rain: The Burial of Callisto and Ganymede in Irregular Satellite Debris

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..258b&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.258

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Scientific paper

The Nice model [1, 2] predicts the giant planets had numerous close encounters with one another 4 Gy ago, and that these events led to the capture of 0.001 lunar masses of comet-like objects on orbits consistent with the known irregular satellites [3]. From there, they experienced substantial collisional evolution, enough to grind themselves down to their current low-mass states [4]. Using numerical simulations, we show that in the Jupiter system, Poynting-Robertson (P-R) drag [5] drove most of the debris, in the form of small particles, onto Callisto and Ganymede. This likely explains why their most ancient terrains appear buried in a 50-200 m layer of dark carbonaceous chondrite-like material.

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