Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths

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http://hdl.handle.net/10138/180939

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Escobar-Cerezo , J , Palmer , C , Munoz , O , Moreno , F , Penttilä , A & Muinonen , K 2017 , ' Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths ' , Astrophysical Journal , vol. 838 , no. 1 , 74 . https://doi.org/10.3847/1538-4357/aa6303

Title: Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths
Author: Escobar-Cerezo, J.; Palmer, C.; Munoz, O.; Moreno, F.; Penttilä, A.; Muinonen, K.
Contributor organization: Department of Physics
Date: 2017-03-20
Language: eng
Number of pages: 17
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/aa6303
URI: http://hdl.handle.net/10138/180939
Abstract: The effect of internal inhomogeneities and surface roughness on the scattering behavior of large cosmic dust particles is studied by comparing model simulations with laboratory measurements. The present work shows the results of an attempt to model a dust sample measured in the laboratory with simulations performed by a ray-optics model code. We consider this dust sample as a good analogue for interplanetary and interstellar dust as it shares its refractive index with known materials in these media. Several sensitivity tests have been performed for both structural cases (internal inclusions and surface roughness). Three different samples have been selected to mimic inclusion/coating inhomogeneities: two measured scattering matrices of hematite and white clay, and a simulated matrix for water ice. These three matrices are selected to cover a wide range of imaginary refractive indices. The selection of these materials also seeks to study astrophysical environments of interest such as Mars, where hematite and clays have been detected, and comets. Based on the results of the sensitivity tests shown in this work, we perform calculations for a size distribution of a silicate-type host particle model with inclusions and surface roughness to reproduce the experimental measurements of a dust sample. The model fits the measurements quite well, proving that surface roughness and internal structure play a role in the scattering pattern of irregular cosmic dust particles.
Subject: comets: general
methods: numerical
planets and satellites: atmospheres
polarization
scattering
RAY OPTICS APPROXIMATION
LIGHT-SCATTERING
ELECTROMAGNETIC SCATTERING
MONTMORILLONITE CLAY
MARS
GRAINS
67P/CHURYUMOV-GERASIMENKO
SIMULATIONS
MINERALOGY
PALAGONITE
115 Astronomy, Space science
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: publishedVersion


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