Journal Article

Dust ejection from (pre-)planetary bodies by temperature gradients: radiative and heat transfer

M. Kocifaj, J. Klačka, G. Wurm, T. Kelling and I. Kohút

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 3, pages 1512-1518
Published in print May 2010 | ISSN: 0035-8711
Published online May 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16370.x
Dust ejection from (pre-)planetary bodies by temperature gradients: radiative and heat transfer

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It has recently been shown that the illumination of dust beds in a low-pressure gaseous environment can generate massive ejections of dust if the light source is turned off. This effect might explain dust entrainment into the atmosphere of Mars and might destroy dusty planetesimals in protoplanetary discs. As ejection mechanism we consider compression of gas by thermal creep through the pores of the dust bed (Knudsen compressor). To approach this problem quantitatively we combine theoretical calculations of radiative and heat transfer with laboratory experiments. In this work we focus on the theoretical aspect and numerical modelling of irradiated surfaces. Temperature gradients calculated and pressure differences established by Knudsen compression are in general agreement to the threshold necessary to eject particles.

Keywords: conduction; radiation mechanisms: thermal; radiative transfer; planets and satellites: surfaces

Journal Article.  3818 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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