Constraining Cometary Particle Size Distributions by Combining Dynamic and Thermal Emission Models

Details Constraining Cometary Particle Size Distributions by Combining Dynamic and Thermal Emission Models Constraining Cometary Particle Size Distributions by Combining Dynamic and Thermal Emission Models

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.1612k&link_type=abstract

American Astronomical Society, DPS meeting #37, #16.12; Bulletin of the American Astronomical Society, Vol. 37, p.647

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a model for cometary coma structures that utilizes grain mineralogy as a basis for determining the dust grain "β ," the ratio of solar radiation pressure to gravity, a parameter inversely proportional to particle size. Generally in models of comae structures, the β distribution, dn/dβ , is an input parameter constrained by fitting coma morphologies to observations. Here, dn/dβ refers to particles released by the nucleus. In this model, we additionally constrain β by fitting the thermal spectral energy distribution with a size distribution of porous siliceous mineral grains and amorphous carbon grains, modeled for an observed aperture on the sky. Both thermal emission and dynamic models have worthy assumptions, but the combination of the two independent methods narrows the allowed parameter space for a more robust constraint on the grain size distribution. We present our efforts to combine a mid-infrared model and dynamic model of comet 2P/Encke as observed by the Spitzer Space Telescope in June 2004.
This work partially supported by the National Science Foundation grant AST-037446.

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