Physics – Optics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..683p&link_type=abstract
European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht
Physics
Optics
Scientific paper
New reflectance spectra of Pluto and Triton taken with ESO adaptive optics instrument NACO at the VLT in the wavelength range (1-5)μm are presented. For Pluto, it is the first time that the L band is measured without contamination by light from Charon, and for both objects M band spectra were never measured before. Apart from known and expected absorption bands from methane ice, our data reveal new absorption bands centered around 4.0μm and 4.6μm never detected before. The latter absorption could be related to the presence of CO ice at the body surfaces. Charon's spectrum is also measured in the wavelength range (1-4)μm, for the first time simultaneously with, but isolated from that of Pluto. Charon's spectrum has previously been studied in some detail in the JHK wavelength region but was never measured above 2.5μm. As expected, our Charon spectrum is dominated by the absorption bands of water ice but a narrow absorption band, unidentified still, is found around 3.7 μm. The nondetection of the - at that time - unknown Pluto moonlets in our short exposures for slit acquisition of Pluto-Charon allows to put a lower limit of 18.8mag for the K band brightness of Hydra and Nix.
Boehnhardt Hermann
Herbst Tom
Protopapa Silvia
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