Meteoroid streams as probes of the subsurface regions of comets

Details Meteoroid streams as probes of the subsurface regions of comets Meteoroid streams as probes of the subsurface regions of comets

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..109..258m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 109, no. 2, p. 258-266

Physics

12

Comet Nuclei, Comets, Meteoroids, Meteoroid Showers, Oort Cloud

Scientific paper

Whipple recognized the importance of the rocket-like volatization forces on a comet nucleus when he formulated his conglomerate model. For near-parabolic comets, a determination of an unbound original orbit when only gravitational forces are included is commonly believed to be indirect evidence of large neglected nongravitational forces. A comet can be given energy either by a symmetric positive transverse nongravitational force or an asymmetric radial nongravitational force, enhanced during the postperihelion phases. We present evidence describing those new Oort cloud comets which are most likely to have experienced large nongravitational forces. A correlation between enhanced episodic outgassing and the passage of these comets through well-known meteor streams is investigated. These results are interpretable as the catalytic increase in volatility as the impacting meteoroids penetrate any surviving mantle and probe the icy subsurface regions. If these exists trapped gas, either in subsurface pockets or at a crystalline/amorphous-ice interface, then it is much more likely to erupt and expose adjacent underlying fresh volatiles when the meteoroids impact the comet, diminishing the tensile strength of the subsurface crystalline layer.

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