Abstract
view Abstract Citations (46) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Formation of an Ice Crust below the Dust Mantle of a Cometary Nucleus Prialnik, D. ; Mekler, Y. Abstract Using a cometary model which assumes a porous cometary nucleus covered by an equally porous thin permanent dust mantle, the possible formation of an ice crust below the surface of the comet nucleus by the condensation of the inward-flowing vapor is investigated. It is found that, for any given porosity value, there is a range of dust-mantle thicknesses at which the formation of a crust is favored. Below this range, sublimation is too strong, making it impossible for any change in the ice structure within a surface layer to occur before the layer evaporates; above this range, the thick dust mantle quenches the vapor production rate. The consequences of the ice crust formation are examined for two models, with the dust mantles 5-mm and 1-mm thick, respectively. Publication: The Astrophysical Journal Pub Date: January 1991 DOI: 10.1086/169564 Bibcode: 1991ApJ...366..318P Keywords: Comet Nuclei; Computational Astrophysics; Cosmic Dust; Ice Formation; Astronomical Models; Condensation; Density Distribution; Heat Transfer; Perihelions; Porosity; COMETS; COMET NUCLEI; FORMATION; ICE; CRUST; DUST; MANTLE; VAPOR; CONDENSATION; POROSITY; THICKNESS; PARAMETERS; HEAT; TRANSPORT; MODELS; HALLEY; SUBLIMATION; STRUCTURE; SURFACE; EVAPORATION; DENSITY; DEPTH; PRODUCTION RATE; TEMPERATURE; FLUX; CALCULATIONS; NUMERICAL METHODS; Astrophysics; Comets; COMETS full text sources ADS |
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