Volume 443, Number 3, December I 2005
|Page(s)||769 - 775|
|Published online||15 November 2005|
Space weathering of near-Earth and main belt silicate-rich asteroids: observations and ion irradiation experiments
Dipartimento di Astronomia, Vicolo dell'Osservatorio 2, 35122 Padova, Italy e-mail: [marchi;s.magrin;lazzarin]@pd.astro.it
2 Dipartimento di Fisica, Università di Lecce, via Arnesano, 73100 Lecce, Italy e-mail: firstname.lastname@example.org
3 INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
4 Dipartimento di Fisica e Astronomia, Università di Catania, via S. Sofia 78, 95123 Catania, Italy e-mail: email@example.com
Accepted: 29 July 2005
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.
Key words: minor planets, asteroids / meteors, meteoroids
© ESO, 2005
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