Analytical solution for the expansion of the Deep Impact vapor plume

Details Analytical solution for the expansion of the Deep Impact vapor plume Analytical solution for the expansion of the Deep Impact vapor plume

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.4415d&link_type=abstract

American Astronomical Society, DPS meeting #37, #44.15; Bulletin of the American Astronomical Society, Vol. 37, p.1568

Astronomy and Astrophysics

Astronomy

1

Scientific paper

In NASA's Deep Impact mission, the spectacular collision of a 370 kg copper projectile with the comet 9P/Tempel 1 took place at a relative speed of 10.2 km/s. The appearance of a gas-dynamic shock wave can be seen in a series of images taken with the high resolution camera (HRI) immediately after the impact. Initially, the gas-dynamic shock follows the limit of a strong explosion R t2/5 expanding into a half-space, to a good degree of approximation. Due to stratification of the coma the geometry is different from hemispherical expansion at a later stage. The geometry and dynamics of the shock wave is investigated in Kompaneet's approximation, simplifying the pre-impact coma in the vicinity of the impact as a spherically-symmetric stationary outflow. The solution is used to estimate the fraction of the kinetic energy of the impactor consumed for vaporization. A second part of the investigation is devoted to re-condensation processes during the rapid expansion. Within homogeneous nucleation theory a two-stage condensation process occurs, forming aerosols at two characteristic sizes. Such a behavior is found in the case of water vapor as well as for evaporated silicates. Both cases can be distinguished by the typical sizes and temperatures of aerosols.

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