| 2 | Aggregate dust model to study the polarization properties of comet C/1996 B2 Hyakutake显示文摘The observed linear polarization data of comet Hyakutake are studied at wavelengths λ=0.365 μm,λ=0.485 μm and 0.684μm 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 ~ 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:λ=0.365 μm,0.485μm and 0.684μm.Thus,the effective radius of the aggregate (r) lies in the range 0.45 μm≤ r ≤ 0.49 μm at λ=0.365 μm;0.60 μm≤ r ≤ 0.66 μm at λ=0.485 μm and 0.88 μm≤ r ≤ 0.94 μm at λ=0.684 μm.Now using superposition T-MATRIX code and the power-law size distribution,n(r) ~ 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 λ=0.365 μm,(1.743,0.100) at λ=0.485 μm and (1.695,0.100) at λ=0.684 μm.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. | Himadri Sekhar Das Abinash Suklabaidya Saonli Datta Majumder Asoke Kumar Sen | 2010 | Research in Astronomy and Astrophysics2010，10，4： | 0 |
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