Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p34a..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P34A-04
Mathematics
Logic
[5410] Planetary Sciences: Solid Surface Planets / Composition, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [6250] Planetary Sciences: Solar System Objects / Moon
Scientific paper
An absorption spectral feature near 3 µm has been reported in the Chandrayaan-1 M3 visual-IR spectral data and has been interpreted as being caused by OH/HOH in or on the lunar surface (Pieters et al., 2009). We will document the characteristics of this absorption in M3 spectra, especially the fact that cooler and shaded areas may have a stronger 3-µm feature, while other areas show a strong 3-µm feature that seems independent of the temperature and the illumination. We will review the potential explanations for the presence of OH/HOH spectral features, and suggest models for the M3 observations. Scenarios for water on the Moon range from actual water molecules migrating about the lunar surface and into cold traps, to intrinsic hydrated/hydroxyl-bearing lunar materials, to surface chemistry effects. It is difficult to define a sufficient source of water that operates over geologic time, and abundant intrinsic water is not supported by analysis of lunar materials, but stranger things have been found. On the other hand, solar-wind implantation can provide abundant protons to the lunar soils that consist of minerals and glasses rich in oxygen and are poorly crystalline. This situation provided conditions that are known to allow formation of OH/HOH associations, and that may also be temperature and illumination dependent, similar to some of the M3 observations. 1 Pieters, C. M. and the M3 team, Character and spatial distribution of OH/H2O on the surface of the Moon seen by M3 on Chandrayaan-1. Science, in press, 2009.
Clark Roger Nelson
Combe J.
Darby Dyar M.
Hibbitts C.
Kramer Georgiana Y.
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