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Thermophysical modelling of Comet P/Borrelly: Effects of volume energy absorption and volume sublimation
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
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
Abstract [en]

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.
Keyword [en]
Cometary nuclei, P/Borrelly, surfaces, thermal models
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-15045DOI: 10.1023/A:1021526115444OAI: oai:DiVA.org:uu-15045DiVA: diva2:42816
Available from: 2008-02-04 Created: 2008-02-04 Last updated: 2013-11-07Bibliographically approved

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Davidsson, Björn
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