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Heating and destruction of the porous surface layer of a cometary nucleus
Andreeva T. A.
1, Bykov N. Y.
1, Zakharov V. V.
2, Lukin A. Ya.
1, Shmyr D. S.1
1Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
2LIRA, Observatoire de Paris, Universite PSL, CNRS, Sorbonne Universite, Universite Paris Cite, Meudon, France
2LIRA, Observatoire de Paris, Universite PSL, CNRS, Sorbonne Universite, Universite Paris Cite, Meudon, France
Email: andreeva_ta@spbstu.ru, nbykov2006@yandex.ru, zvv1661@yandex.ru, lukin_aya@spbstu.ru
A thermal model of a cometary surface layer with closed pores is considered. Closed cavities (pores) could have formed as a result of accretion of the cometary nucleus from icy and refractory particles and its further evolution. With a heating of the surface layer, the gaseous products of sublimation escape into outer space through open pores. The amount of ice decreases and gas from previously closed pores creates high pressure in the surface layer sufficient for its destruction and formation of dusty-gas flow. Keywords: comets, porous near-surface layer of a cometary nucleus, thermal conductivity, gas diffusion, numerical simulation.
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