科研之友
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摘要
The observed linear polarization data of comet Hyakutake are studied at wavelengths lambda = 0.365 mu m, lambda = 0.485 mu m and 0.684 mu m through simulations using Ballistic Particle-Cluster Aggregate and Ballistic Cluster-Cluster Aggregate aggregates of 128 spherical monomers. We first found that the size parameter of the monomer, x similar to 1.56 - 1.70, turned out to be the most suitable which provides the best fits to the observed dust scattering properties at three wavelengths: lambda = 0.365 mu m, 0.485 mu m and 0.684 mu m. Thus, the effective radius of the aggregate (r) lies in the range 0.45 mu m <= r <= 0.49 mu m at lambda = 0.365 mu m; 0.60 mu m <= r <= 0.66 mu m at lambda = 0.485 mu m and 0.88 mu m <= r <= 0.94 mu m at lambda = 0.684 mu m. Now using superposition T-MATRIX code and the power-law size distribution, n(r) similar to r(-3), the best-fitting values of complex refractive indices are calculated for the observed polarization data at the above three wavelengths. The best-fitting complex refractive indices (n, k) are found to be (1.745, 0.095) at lambda = 0.365 mu m, (1.743, 0.100) at lambda = 0.485 mu m and (1.695, 0.100) at lambda = 0.684 mu m. The refractive indices derived from the present analysis correspond to a mixture of both silicates and organics, which are in good agreement with the in situ measurement of comets by different spacecraft.
- 出版日期2010-4
