Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80116e&link_type=abstract
Spitzer Proposal ID #80116
Other
Scientific paper
We propose to measure broadband reflected fluxes of 25 Resonant Kuiper Belt objects (KBOs), 16 scattered disk objects, and 6 Centaurs with IRAC in order to determine surface compositions. The small bodies of the outer Solar System provide probes of the statistical conditions, history, and interactions in the Solar System. We focus in this proposal on two groups in order to extend our previous observations to address the origin of the hot vs. cold classical populations, the source and fate of Centaurs, and the overall spectral diversity among KBOs. Many objects have been found occupying mean-motion resonances (MMRs) with Neptune. The existence of these resonant populations led to the understanding that Neptune had migrated outward during its history. Different styles of migration have been suggested for Neptune, with distinct implications for the distribution of the physical properties of resonant objects. We will test which scenario is best explains the origin of resonant objects by searching for the strong 3.6-micron absorption, further characterizing composition with the 4.5-micron channel, and searching for trends among the various resonances (i.e. with distance). Objects in the scattered disk have been or are currently being gravitationally scattered by Neptune. The overall range of compositions should be similar to that among the resonant population as a whole, since the two groups sample the same primordial population, but the scattered disk objects should be more well-mixed. We will use this group to identify endmember compositions for the resonant bodies. This proposal directly builds on the success of previous Spitzer observations that have characterized a small sampling of the KBO diversity and obtained a deeper view of the other major dynamical populations.
Brown Michael
Cruikshank Dale
Dalle Ore Cristina
Emery Joshua
Fernandez Yanga
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