Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1610y&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1610
Physics
Scientific paper
The published thermal infrared (TIR) emission spectra of three Trojan asteroids obtained with the Spitzer space telescope consistently exhibit a 10-μm emissivity plateau that closely resemble the emission feature of active comets (Emery et al., 2006). Emery et al. suggested that the Trojan surfaces may consist of finegrained silicates suspended in a transparent matrix. To explore Emery's hypothesis, we developed a new radiative transfer model with the goal of determining whether both the NIR and thermal IR spectra could be explained by the same model. We find that the Trojan spectra in both wavelength regions can be explained by 1wt% silicates and 2-10 wt% highly absorbing material (such as carbon and iron) suspended in a transparent matrix if the particles are 1 μm in size or smaller. Fine-grained silicates, carbon and iron (the latter found in abundance in Stardust samples from Wild 2) may have originated from cometary or asteroidal collisions. Debris from such collisions could have been transported outwards from the inner solar system by radiation pressure, contaminating the surfaces of the Trojans..
Glotch Timothy
Lucey Paul
Yang Bokai
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