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The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument aboard the Rosetta spacecraft has performed extensive spectral mapping of the surface of comet 67P/Churyumov-Gerasimenko in the range 0.3–5µm. The reflectance spectra collected across the surface display a low reflectance factor over the whole spectral range, two spectral slopes in the visible and near-infrared ranges and a...
In this study, we measured bidirectional reflectance spectra (0.5–4.0μm) of 24 CMs, five CRs, one CI, one CV, and one C2 carbonaceous chondrites. These meteorites are known to have experienced an important variability in their relative degrees of aqueous alteration degree (Rubin et al. [2007]. Geochim. Cosmochim. Acta 71, 2361–2382; Howard et al. [2009]. Geochim. Cosmochim. Acta 73, 4576–4589; Howard...
Little is known about carbonaceous asteroids weathering in space as previous studies have struggled to define a general spectral trend among dark surfaces. Here we present experiments on ion irradiation of the Allende meteorite, performed using 40keV He + and Ar + ions, as a simulation of solar wind irradiation of primitive bodies surfaces. We used different fluences up to 3×10 ...
In this work, infrared transmission spectra (2–25μm range, 5000–400cm −1 ) of 40 carbonaceous chondrites were analyzed (21 CMs, 5 CVs, 6 CRs, 3 CKs, 3 C2s and 2 CIs). All these meteorite groups are known to have experienced significant aqueous alteration (except the CKs). These IR measurements provide information about the parent body processes experienced, as well as spectra for comparison...
The line intensities of the fundamental rotational transitions of H 13 CN and HC 15 N were observed towards two prestellar cores, L183 and L1544, and lead to molecular isotopic ratios 140⩽ 14 N/ 15 N⩽250 and 140⩽ 14 N/ 15 N⩽360, respectively. The range of values reflect genuine spatial variations within the cores. A comprehensive analysis of the available...
The Howardite–Eucrite–Diogenite (HED) suite is a family of differentiated meteorites that provide a unique opportunity to study the differentiation of small bodies. The likely parent-body of this meteorite group, (4) Vesta is presently under study by the Dawn mission, scrutinizing its surface in the visible and NIR infrared range. Here, we discuss how well the magmatic trends observed in HED might...
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