Analysis of silicate feature by irregular particle

Abstract

Dust shape is assumed as a sphere. In this study, we analyze how the irregular particle contributes to the silicate feature. We used a fractal aggregate (BPCA) as an irregular particle. We apply Mie theory for the sphere, and DDA code for the fractal aggregate to compute the absorption efficiencies. As the result, no significant feature exists, the temperature grain is derived and the silicate features are revealed near a wavelength 10micronmeters for both sphere and fractal aggregate. We found when the radius is larger the feature appears in fractal aggregate while in the sphere.