Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0601v&link_type=abstract
American Astronomical Society, DPS meeting #42, #6.01; Bulletin of the American Astronomical Society, Vol. 42, p.951
Other
Scientific paper
The "Nice model” describes a scenario in which the Jovian planets experienced a violent reorganization 3.9 Gyr ago. One discrepancy, however, is that the Nice model predicts that transported KBOs should dominate the outer part of the main asteroid belt. Reflectance spectra of these objects are expected to look like the spectra of the D-class asteroids: dark plus increasing reflectance with increasing wavelength ("reddening"). The outer main asteroid belt, however, is dominated by the grossly spectrally neutral ("grey") C-type asteroids from 2.6 to 3.2 AU. Perhaps 50% of these C-class asteroid spectra also show absorption features in the 0.4 - 3.5 µm range suggesting aqueous alteration. Bottke et al. (LPSC XXXIX, 1447, 2008) argue that more than 90% of the objects captured in the outer main belt could have been eliminated by impacts in the violent reshuffling episode, if they had been weakly-indurated objects. These disrupted objects should have left behind pieces in the ancient regoliths of other - presumably stronger - asteroids. The observed aqueous alteration absorption features have generally not been detected in spectra of D-class asteroids. Now, the existence of features attributed to aqueous alteration products is suggested in the reddened photometry and spectra of outer irregular jovian and saturnian satellites, and some outer-belt D-type asteroids (e.g., Vilas et al., Icarus 180, 453, 2006). To investigate further, VNIR narrowband spectroscopy was obtained of irregular satellites JVI Himalia, JVII Elara, JVIII Pasiphae, JIX Sinope, JX Lysithea, JXI Carme, JXII Ananke in 2006, 2008, 2009, 2010 using the MMT Observatory facility Red Channel spectrograph centered near 6400 Å to cover the 0.7-µm feature entirely. These spectra sample the prograde (i = 28o), two retrograde (i = 149o, 165o) and independent satellites. These data will be discussed in the context of compositional similarities with C and D type asteroids.
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