Experimental Study of IR-Signature of Water Ices between 1 and 2.5 µm : Application for Icy Moons

Details Experimental Study of IR-Signature of Water Ices between 1 and 2.5 µm : Application for Icy Moons Experimental Study of IR-Signature of Water Ices between 1 and 2.5 µm : Application for Icy Moons

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4820g&link_type=abstract

American Astronomical Society, DPS meeting #42, #48.20

Astronomy and Astrophysics

Astronomy

Scientific paper

Near-IR signatures of water ices are known to depend on temperature and grain size, a property that is currently used to constrain the surface characteristics of icy moons. Models suggest that the 1.65 µm absorption band depends mostly on temperature while the bands at 1.30 µm and 1.50 µm change with grain size. Nonetheless, the second parameter may be of significant importance in some cases. In this work, the relative dependence on temperature and grain size of the 1.3 µm and the broad 1.5 µm absorption bands have been determined.
Characteristics of near-IR spectra of pure ice Ih grains have been experimentally investigated. 47 spectra in diffuse reflectance of thin samples (< 100 µm) have been produced with icy grains ranging from 60 to 1000 µm at temperatures between 80 and 180 K. This work demonstrates that i) the total area of the large 1.50 µm band is a very good indicator of grain size because its dependence on temperature from 80 K to 140 K is negligible, ii) te temperature effect can quantified only if a reduced area of the narrow bands at 1.30 µm and 1.50 µm is used. This reduced area is based on the inflexion points detected on these bands. Scaling laws have been produced, which allow to retrieve from the IR spectra both the temperature and grain size of the samples.
We have applied these scaling laws to VIMS images of Enceladus, in order to characterize the Tiger Stripes area. The estimated temperatures are consistent with those obtained by CIRS. Grain sizes are in good agreement with a previous model, i.e., the grain size is larger on the Tiger Stripes than in the surroundings. The grain size and temperature distribution maps will be presented.

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