Ultraviolet spectra of minerals and rocks relevant to airless bodies

Mathematics – Logic

Scientific paper

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[5494] Planetary Sciences: Solid Surface Planets / Instruments And Techniques, [6297] Planetary Sciences: Solar System Objects / Instruments And Techniques

Scientific paper

Reflectance spectroscopy from the ultraviolet (UV) through infrared is used to determine the composition of solar system objects from asteroids to gas giants. Ultraviolet spectroscopy is often used to characterize small amounts of dispersed media, for example during probing tenuous atmospheres and characterizing aurora as well as exploring atmospheric chemistry. It has also been used to characterize the compositions of solid surfaces of airless bodies such as the icy Galilean and Saturnian satellites [1,2], Mercury [3], and the Moon [3,4]. Spacecraft have obtained reflectance spectra of solid-surfaced airless bodies throughout the ultraviolet through visible (~ 100 to 750nm) that show absorption features indicative of mineral composition and processes such as space weathering. We are obtaining vacuum UV - infrared (~ 130 - 5000 nm) bidirectional reflectance spectra of minerals and rocks under vacuum and at different temperatures to increase the library of available UV reflectance spectra and to assist in the interpretation of these types of observations. Reflectance spectra of olivine and montmorillonite are consistent with those measured previously [5]. We are expanding our results to minerals relevant to Mercury, where understanding UV reflectance may prove critical for mineralogical interpretation of surface spectroscopy [6], as well as exploring the effect of hydration and temperature on UV spectra. [1] Hendrix, A.R. et al., Icarus, 135, 79-84, 1998. [2] Hendrix, A.R., and C.J. Hansen, Icarus 193, 323-333, 2008. [3] Holsclaw, G.M. et al., Icarus, 209, 179-194, 2010. [4] Gladstone, G.R. et al., Science, 330, 472-476, 2010. [5] Cloutis, E. A., Icarus, 197, 321-347, 2008. [6] Izenberg et al., AGU Fall 2011 Abstract ID: 119846

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