Optical polarimetry of sulphur and the surface microstructure of Io

Astronomy and Astrophysics – Astronomy

Scientific paper

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Io, Optical Polarization, Planetary Structure, Polarimetry, Satellite Surfaces, Sulfur, Abundance, Cosmic Dust, Microstructure, Silicates, Surface Properties, Volcanoes, Jupiter, Satellites, Io, Optical Properties, Polarimetry, Structure, Sulfur, Albedo, Comparisons, Regolith, Contamination, Composition, Silicate, Analogs, Simulations, Laboratory Studies, Condensation, Formation, Volcanism, Source, Grains, Size

Scientific paper

Polarimetric and albedo measurements of various sulphur samples are reported and compared with data for Io. The most likely form of sulphur covering the surface of Io is the form of μm-sized grains, having been rapidly condensed from the vapour phase in volcanic eruptions. However, polarimetric and albedo measurements of such samples strongly suggest that the sulphur regolith on Io is contaminated with silicate minerals. Good agreement with data for Io is obtained from a thick roughened layer of sublimed sulphur contaminated with a silicate slag of albedo 0.13 covering about 19 per cent of the surface area.

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