Dust temperature and radiation pressure forces of irregular shaped dust particles in the extrasolar planetary system

Abstract

Dust temperature in the extrasolar planetary system is determined in the different kind of surrounding radiative environment. We have estimated dust temperature for fractal dust like BPCA (Ballistic Particle-Cluster Aggregate) using MG-Mie theory and for spherical one using Mie theory. We have found that dust temperature for fractal does not show the minimum around 10 micrometer radius, which can be seen for sphere. The other finding is that dust less than about 0.6 micrometer size shows lower temperature for fractal dust and for the larger size fractal shows higher temperature.