Local activity of comets: an indicator of non-uniform composition

Autor:	Leszek Czechowski, Konrad J. Kossacki
Rok vydání:	2019
Předmět:	Physics 010504 meteorology & atmospheric sciences Space and Planetary Science 0103 physical sciences Astronomy and Astrophysics Composition (combinatorics) 010303 astronomy & astrophysics 01 natural sciences 0105 earth and related environmental sciences Astrobiology
Zdroj:	Monthly Notices of the Royal Astronomical Society. 490:2050-2055
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/stz2739
Popis:	In this paper, we investigate the conditions for the local ejection of a metamorphosed surface layer of material from a comet. We have calculated the strengthening of the material of the nucleus of comet 67P/Churyumov–Gerasimenko and the increase of gas pressure in pores. We are interested in the boundary between the regions Anhur and Bes, where an active pit has been identified. We show that material rich in ice can be exposed as a result of the local ejection of the strengthened layer of material several metres thick. This process does not require locally increased concentrations of very volatile components, such as carbon monoxide. A sufficient condition is the heterogeneity of material granulation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27adee6458b3483a2973ae835222cc14 https://doi.org/10.1093/mnras/stz2739 Zobrazit plný text záznamu