The Detection of Water Ice in Comet Hale-Bopp

Details The Detection of Water Ice in Comet Hale-Bopp The Detection of Water Ice in Comet Hale-Bopp

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ames.rept.....d&link_type=abstract

Technical Report, NASA Ames Research Center Moffett Field, CA United States

Mathematics

Comets, Near Infrared Radiation, Infrared Spectra, Grain Size, Water, Carbon, Ice, Infrared Spectrometers, Absorption Spectra, Mathematical Models, Amorphous Materials, Scattering, Detection

Scientific paper

We present spectra of Comet Hale-Bopp (C/1995 01) covering the range 1.4-2.5 micron that were recorded when the comet was 7 AU from the Sun. These show I)road absorption features at 1.5 and 2.05 micron. We show that some, but not all, of this absorption could be matched by an intimate mixture of water ice and a low albedo material such as carbon on the nucleus. However, we recognize that it is more likely that the ice features are produced by scattering from icy grains in the coma. The absence of absorption at 1.65 micron suggests that this ice is probably in the amorphous state. An unidentified additional component may be required to account for the downward slope at the longwavelength end of the spectrum.

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