Thermophysical modelling of Comet P/Borrelly: Effects of volume energy absorption and volume sublimation
2002 (English)In: Earth, moon, and planets, ISSN 0167-9295, E-ISSN 1573-0794, Vol. 90, no 1, 293-303 p.Article in journal (Refereed) Published
In this work, we continue revising the theoretical basis of numerical models describing the transport of matter and energy inside a porous dust-ice mixture at low temperature. A model of a light-absorbing near-surface layer of a comet nucleus is investigated. Gas transport is considered simultaneously with the solution of the general heat transfer equation. The quasi-stationary temperature distribution and the H2O mass flux and sublimation rate are computed for a nucleus model of comet 19P/Borrelly at the Deep Space 1 (DS1) encounter. The energy is deposited in a layer of about 20 particle radii: This corresponds to a solid-state greenhouse effect. The surface temperature of the layer-absorbing model as well as the gas production rate are significantly smaller than the ones in the surface-absorbing model. An active fraction of 40-50% would be required to explain the observed water production rate of P/Borrelly with our layer-absorption model at the time of the DS1 encounter.
Place, publisher, year, edition, pages
2002. Vol. 90, no 1, 293-303 p.
Cometary nuclei, P/Borrelly, surfaces, thermal models
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-15045DOI: 10.1023/A:1021526115444OAI: oai:DiVA.org:uu-15045DiVA: diva2:42816