Mathematics – Logic
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2606p&link_type=abstract
American Astronomical Society, DPS meeting #42, #26.06; Bulletin of the American Astronomical Society, Vol. 42, p.1025
Mathematics
Logic
1
Scientific paper
Quantifying surface composition is essential to interpreting the surface features and understanding the formation, evolution, and interior processes of icy satellites from spacecraft spectrometer and imaging data. The composition of icy body surfaces can be constrained to first order by comparing to laboratory reflectance spectra obtained under appropriate conditions of temperature and pressure, and related linear (area-based) mixture modeling. More advanced quantitative determination of surface abundances via nonlinear mixing models requires optical functions or "constants” (real and imaginary indices of refraction, n(λ) and k(λ)). In this work, we investigate three hydrated Mg sulfates (epsomite, bloedite, hexahydrite) that are spectrally similar to observations of non-icy surface deposits on outer Solar System icy satellites and Mars. These compounds are particularly important because they have aqueous chemistry consistent with that predicted for subsurface oceans and paleolake basins on Europa, Ganymede, Enceladus, and Mars and may be useful indicators of astrobiological potential. We present n(λ) and k(λ), derived from laboratory reflectance spectra (Dalton et al., 2005, Icarus 177, 472) acquired at visible to near-infrared wavelengths, for epsomite, bloedite, and hexahydrite at both 300 K (valid for Earth and Mars equatorial regions) and 120 K (optimized for Europa's dayside temperature). Applications of these cryogenic n(λ), k(λ) data to radiative transfer models of telescopic observations of icy worlds and mission data (Galileo NIMS, Cassini VIMS, and New Horizons LEISA) will be discussed. This work is supported through the NASA Outer Planets Research Program.
Dalton B. III J.
Pitman Karly M.
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