Space weathering of near-Earth and main belt silicate-rich asteroids: observations and ion irradiation experiments

Details Space weathering of near-Earth and main belt silicate-rich asteroids: observations and ion irradiation experiments Space weathering of near-Earth and main belt silicate-rich asteroids: observations and ion irradiation experiments

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...443..769m&link_type=abstract

Astronomy and Astrophysics, Volume 443, Issue 3, December I 2005, pp.769-775

Astronomy and Astrophysics

Astrophysics

34

Minor Planets, Asteroids, Meteors, Meteoroids

Scientific paper

In this paper we report the results of a comparison between ion irradiation experiments (N^+, Ar^+, Ar++) on silicates, a large spectral data set of silicate-rich (S-type) asteroids, and ordinary chondrite meteorites (OCs). Ion irradiation experiments - conducted on Fe-poor olivine, Fe-poor orthopyroxene, bulk silicate-rich rocks and one OC - have been monitored by means of reflectance spectroscopy (0.3-2.5 μm). All these experiments produce reddening and darkening of reflectance spectra. The observational data consist of a set of visible and near-infrared (0.4-2.4 μm) spectra of S-type asteroids, that belong to main belt (MBAs) and near-Earth (NEOs) populations. By analyzing the spectra of OCs, MBAs, and NEOs, we find a similar mineralogy between most asteroids and meteorites, but different distributions of spectral slopes. We interpret these findings in the frame of space weathering induced by solar wind ion irradiation.

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