Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534402b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #344.02; Bulletin of the American Astronomical Society, Vol. 42, p.450
Other
Scientific paper
My research focuses on the visual geometric albedos of TNOs and how albedo varies with dynamical class. By studying TNOs, we learn about conditions in the solar system: the density of matter in the protoplanetary disk, the composition of primordial regions, planetary migration, stirring of the disk, stellar close encounters, collision histories, binary capture, and space weathering. What we learn about how our solar system evolved also can be applied to debris disks surrounding other stars.
Using infrared images from MIPS-SST, I measured the thermal flux with PSF-fitting photometry at 23.68 micron and 71.42 micron for fifteen TNOs. The flux measurements and the absolute visual magnitude for each object were fit with the STM in order to constrain the object's albedo and radius. The sample was constructed from new targets and those previously published in the work of Stansberry et al. (Solar System Beyond Neptune p161, 2008), Grundy et al. (Icarus 176:184, 2005), and Grundy et al. (Icarus 200:627, 2009). A correlation was found between albedo and inclination for Classical KBOs not including inner Classicals. The dynamically cold Classicals have higher albedos than hot Classicals. The albedos of the two populations are drawn from different parent distributions if one assumes an inclination break between them of 2.4º to 8.8º.
It has already been shown that cold Classicals and hot Classicals differ in color, magnitude, and binary fraction. The high albedos of cold Classicals extend support for orbital dynamic theories that involve different formation regions, methods of transport, or surface alterations for the hot and cold Classical KBO populations. Accurate albedos and radii can be applied to size and mass distributions of the Kuiper belt and the high albedos found for cold Classical KBOs reduce the estimate for the total mass in this region by almost an order of magnitude.
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