Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397..883g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 2, pp. 883-889.
Astronomy and Astrophysics
Astronomy
1
Comets: General, Comets: Individual: 17P/Holmes
Scientific paper
The catastrophic thermodynamic destruction of large cometary heterogeneous grains lying on the surface of a comet nucleus is examined. The core-mantle grain-structure model is assumed. Grain fragmentation as an explanation of sudden changes in cometary brightness is proposed. The approach presented to the problem of cometary outbursts is a development of a previous author's paper. The proposed mechanism is based on the idea of thermodynamical destruction of heterogeneous cometary grains. Numerical simulations have been carried out for a wide range of values of physical characteristics of cometary material. The results obtained are consistent with observational data. The main conclusion of this paper is that thermodynamical fragmentation of large grains can explain variations in brightness and also outbursts of comets.
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