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Ion irradiation of carbonaceous chondrites A new view of space weathering on primitive asteroids.pdf
Icarus 285 (2017) 43–57
Contents lists available at ScienceDirect
Icarus
journal homepage: /locate/icarus
Ion irradiation of carbonaceous chondrites: A new view of space weathering on primitive asteroids
C. Lantz a,?, R. Brunetto b, M.A. Barucci a, S. Fornasier a, D. Baklouti b, J. Bour?ois c, M. Godard c
a Laboratoire d’étude Spatiales et d’Instrumentation en Astrophysique (LESIA) – Observatoire de Paris, PSL Research University, CNRS (UMR 8109) / UPMC, Sorbonne Universités/Univ. Paris Diderot, Sorbonne Paris Cité, 92195 Meudon Cedex, France b Institut d’Astrophysique Spatiale (IAS), UMR 8617 CNRS/Univ. Paris Sud, Univ. Paris-Saclay, Batiment 104, 91405 Orsay Cedex, France c Centre de Sciences Nucléaire et de Sciences de la Matière (CSNSM), UMR 8609 CNRS/IN2P3 – Univ. Paris Sud, Univ. Paris-Saclay, Batiment 104, 91405 Orsay Cedex, France
article info
Article history: Received 1 April 2016 Revised 12 December 2016 Accepted 15 December 2016 Available online 16 December 2016
Keywords: Asteroids Surfaces Spectroscopy Meteorites Experimental techniques
abstract
We present an experimental study on ion irradiation of carbonaceous chondrites, simulating solar wind irradiation on primitive asteroids, to better constrain the space weathering processes of low albedo objects. The irradiations were performed on pressed pellets of the CV Allende, CO Frontier Mountain 95002 and Lancé, CM Mighei, CI Alais, and ungrouped Tagish Lake meteorites, as well as on some silicate samples (olivine and diopside). We used 40keV He+ with ?uences up to 6 × 1016 ions/cm2 corresponding to timescales of 103–104 years for an object in the Main Belt. Re?ectance spectra were acquired ex situ before and after irradiations in the visible to mid-infrared range (0.4–16 μm). Several spectral modi?cations are observed. In the MIR range, we observe a shift of the phyllosilicates (near 3 and 10 μm) and silicates (near 10 μm) bands toward longer wavelength. In the visible-NIR range, spectral darkening and red
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