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Near-Infrared Spectral Monitoring of Pluto's Ices II: Recent Decline of CO and N$_2$ Ice Absorptions

IRTF/SpeX observations of Pluto's near-infrared reflectance spectrum during 2013 show vibrational absorption features of CO and N$_2$ ices at 1.58 and 2.15 μm, respectively, that are weaker than had been observed during the preceding decade. To reconcile declining volatile ice absorptions with a lack of decline in Pluto's atmospheric pressure, we suggest these ices could be getting harder to see because of increasing scattering by small CH$_4$ crystals, rather than because they are disappearing from the observed hemisphere.

preprint2014arXivOpen access
W. M. GrundyC. B. OlkinL. A. YoungB. J. Holler
astro-ph.EP
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W. M. GrundyC. B. OlkinL. A. YoungB. J. Holler

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