Goethite as an alternative origin of the 3.1 μm band on dark asteroids

Details Goethite as an alternative origin of the 3.1 μm band on dark asteroids Goethite as an alternative origin of the 3.1 μm band on dark asteroids

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...526a..85b&link_type=abstract

Astronomy and Astrophysics, Volume 526, id.A85

Astronomy and Astrophysics

Astrophysics

6

Meteorites, Meteors, Meteoroids, Minor Planets, Asteroids: General, Minor Planets, Asteroids: Individual: 24-Themis, Minor Planets, Asteroids: Individual: 1-Ceres

Scientific paper

Context. The reflectance spectra of some main-belt asteroids contain a 3-μm band, which is explained by the presence of water or hydroxyl groups in minerals. Recent observations of 24-Themis have been found to display evidence of water ice. Aims: We synthesize iron oxy-hydroxide materials and in the laboratory measure their near-infrared spectra under dry conditions to compare with asteroid observations. Methods: The syntheses are performed using either the well-established titration method or a non-conventional hydrothermal method. Bi-directional near-infrared reflectance spectra are obtained using the spectrogonio radiometer available at LPG/IPAG. Spectra are measured in a vacuum to avoid contamination by adsorbed water. Results: The reflectance spectra that we measure for synthesized goethite are consistent with published transmission spectra. The 3-μm band in goethite has a minimum around 3.10 μm, similar to observations of 24-Themis. Its overall shape matches well Themis's 3-μm band; goethite-like oxy-hydroxydes are a viable alternative way of explaining 24-Themis near-IR spectra

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