Expectations for the deep impact collision from cometary nucleus modelling

Details Expectations for the deep impact collision from cometary nucleus modelling Expectations for the deep impact collision from cometary nucleus modelling

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..163m&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using the cometary nucleus model developed by Espinasse et al. (1991), we calculate the thermodynamical evolution of Comet 9P/Tempel 1 over a period of 360 years. Starting from an initially amorphous cometary nucleus which incorporates an icy mixture of H2O and CO, we show that, at the time of Deep Impact collision, the surface of crater exposed to space should not be primordial. We next show that heating effects play no role in the evolution of crater activity. We calculate that the CO production rate from the impacted region should be increased in comparison with the unperturbed nucleus in the immediate post-impact period. We also show that the H2O production rate is decreased by several orders of magnitude at the crater base just after ablation.

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