Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11c1292r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P11C-1292
Physics
5464 Remote Sensing, 5470 Surface Materials And Properties, 6020 Ices, 6270 Pluto And Satellites, 6285 Trans-Neptunian Objects
Scientific paper
Optical constants, the real and imaginary indices of refraction, are the fundamental values used in a wide variety of radiative transfer models that are relevant to many environments including circumstellar disks, planetary atmospheres, and planetary surfaces. Cook et al. (2007) observed a feature near 2.2 micrometers (um) in the reflectance spectrum of Pluto's moon, Charon. They suggested evidence for both ammonia di- hydrate and ammonia hemi-hydrate on opposite hemispheres of Charon. Moore et al. (2003) discuss the irradiation of N2-CH4-CO ices; mixtures relevant for Pluto, Triton, and a plausible constituent for some Kuiper Belt Objects and Centaurs. One stable product observed after irradiation of the ice mixture is the ammonium ion, NH4+. NH4+ has strong spectral features in the 3-4 um region and weaker overtones near 2.21 and 2.24 um (Moore et al. 2003). The 2.21 um feature is the strongest of the overtone bands and is near the wavelengths observed for Charon. Using the measurements of Moore et al. (2003) the optical constants of NH4+ are estimated and will be available to investigate NH4+ as an alternative candidate for the feature observed on Charon. Moore, M. et al. 2003, Earth Moon Planets, 92, 291-306. Cook, J. et al. 2007, Ap J, 663, 1406-1419.
Cook Jason C.
Moore Marla H.
Roush Ted L.
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