Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...471..331d&link_type=abstract
Astronomy and Astrophysics, Volume 471, Issue 1, August III 2007, pp.331-334
Astronomy and Astrophysics
Astrophysics
28
Kuiper Belt, Techniques: Spectroscopic, Astrochemistry, Infrared: Solar System
Scientific paper
Aims:The surface composition of the largest TNO, the dwarf planet 136199 Eris, is studied and compared to Pluto's. Methods: High signal-to-noise visible and near-infrared reflectance spectra were obtained at the TNG and ESO-VLT observatories. The nature and properties of the compounds present on the surface of Eris are investigated by applying Hapke and Shkuratov radiative transfer models to our spectra. Results: The surface of Eris can be modeled using two areas of distinct composition: about 50% appears to be covered with pure methane ice, while the rest of its surface would be made of an intimate mixture of methane, nitrogen and water ices, and ice tholin. The use of nitrogen in our model is shown to improve significantly the data fit, in particular for high surface albedo values. The icy grains are found to be large, from sub-mm to a few tens of mm in size.
Barucci Maria-Antonella
de Bergh Catherine
Doressoundiram Alain
Dumas Cédric
Guilbert Aurélie
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