Analysis of Coma Dust Optical Properties in Comet C/1995 O1 (Hale-Bopp). II. Effects of Polarization

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Scientific paper

Efforts to apply a single-scattering polarized radiative transfer code to interpret photopolarimetric measurements of coma dust optical properties in Comet Hale-Bopp corroborate previous photometrically derived conclusions concerning the predominance of small sized particles in Hale-Bopp's coma. Calculations of the degree of linear polarization (DP) as a function of observation phase angle (α) produced by prolate spheroidal crystalline olivine particles with effective radii (a=0.216 μm) are compatible with the comet's measured polarization in standard filters at λ=0.4845 and 0.684 μm. Our rudimentary ``trade-off'' studies highlight the extreme sensitivity of DP to dust particle size and shape. A combination of viewing geometry effects in association with enhanced multiple scattering might provide a quantitative explanation of the negative polarization for 0°<=α<=20° seen in Hale-Bopp and other comets.

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