Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006oleb...36..507l&link_type=abstract
Origins of Life and Evolution of Biospheres, Volume 36, Issue 5-6, pp. 507-514
Physics
2
Comet Nucleus, Cometary Dust, Dust Particles, Early Bombardment, Fragmentation, Interplanetary Dust, Light Scattering, Physical Properties, Splitting
Scientific paper
During the epoch of early bombardment, terrestrial planets have been heavily impacted by cometary nuclei and cometary dust particles progressively injected in the interplanetary medium. Stardust and Deep Impact missions confirm that the nuclei are porous, loosely consolidated objects, with densities below 1,000 kg m-3, and that they often release small fragments of ices and dust. Recent numerical simulations of the light scattering properties of cometary dust particles indicate that they are highly porous, most likely fractal, and rich in absorbing organics compounds (with a mixture ratio of e.g. 33 to 60% in mass for comet Hale Bopp). Taking into account the fact that porous structures survive more easily than compact ones during atmospheric entry, such results reinforce the scenario of the early terrestrial planets enrichment in organics needed for life to originate by comets.
Desvoivres Emmanuel
Lasue Jeremie
Levasseur-Regourd Anny-Chantal
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