Fluidization and Multiphase Transport of Particulate Cometary Material as an Explanation of the Smooth Terrains on 9P/Tempel 1

Details Fluidization and Multiphase Transport of Particulate Cometary Material as an Explanation of the Smooth Terrains on 9P/Tempel 1 Fluidization and Multiphase Transport of Particulate Cometary Material as an Explanation of the Smooth Terrains on 9P/Tempel 1

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0205b&link_type=abstract

American Astronomical Society, DPS meeting #40, #2.05; Bulletin of the American Astronomical Society, Vol. 40, p.388

Astronomy and Astrophysics

Astronomy

Scientific paper

The Deep Impact mission discovered several smooth terrains and repetitive outbursts on comet 9P/Tempel 1 suggestive of cryo-volcanic activity in its interior. We present new measurements of the extent of the smooth terrains, the slopes along their centerlines, and the areas of their likely source regions and vents. Our analysis of these features indicates that they may be only a few orbits old and the result of an ongoing process. Given the implications of the recently found locations of repetitive outbursts, we propose that the origins of the smooth terrains are in the different regimes of fluidization and gas transport in a weakly bound particulate mixture of ice and dust above an amorphous to crystalline water ice phase transformation boundary where CO and/or CO2 is released. The stresses due to gas pressure extrude, at low velocity, fluidized and dilated, gas-laden cometary material onto the surface leading to downhill flow and, ultimately, collapse at the surface.

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