Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...363.1155c&link_type=abstract
Astronomy and Astrophysics, v.363, p.1155-1165 (2000)
Astronomy and Astrophysics
Astrophysics
3
Polarization, Scattering, Ism: Dust, Extinction, Stars: Circumstellar Matter
Scientific paper
In order to quantify the effects of shape of grains on their optical properties, we use a new statistical approach to study the effects of roughness on the degree of linear polarization. In this approach, we compute the degree of linear polarization of light scattered by a rough grain. The roughness is obtained by a random depletion of the surface of an homogeneous sphere. The analysis of the results is achieved through a specific statistical method: the probability density function of the linear polarization Pl is estimated by a Gaussian kernel method. This method allows the characterization of effects specifically due to the roughness. The grain is described by the Discrete Dipole Approximation (DDA) \citep{Drai88}. We present the preliminary results for a spherical grain of water ice with radius aeff =~ 0.3 μm which is comparable to the incident wavelength lambda =1.88 μm where water ice is non-absorbing. The effect of grains roughness on polarization can be distinguished from the effects of volume in several different ways. The shape of the density function of the polarization is found to be non-symmetrical to the mean value of Pl and non-unimodal for several scattering angles. We compare the mean value of the linear polarization deduced from the probability density function to the value obtained from a mass equivalent sphere and from the core sphere. We present the effects of roughness for various scattering angles.
Chamaillard K.
Lafon Jean-Pierre J.
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