Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.404.1512k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 404, Issue 3, pp. 1512-1518.
Astronomy and Astrophysics
Astronomy
4
Conduction, Radiation Mechanisms: Thermal, Radiative Transfer, Planets And Satellites: Surfaces
Scientific paper
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.
Kelling Thorben
Klacka Jozef
Kocifaj Miroslav
Kohút I.
Wurm Gerhard
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