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Polarization in IR bands and the structure of cosmic dust grains

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Abstract

The water ice and silicate dust bands centered at about 3 and 10 µm, respectively, are simultaneously observed in the spectra of several objects. So far the wavelength dependence of the polarization in both bands has been modeled using two-layer spheroids, with the shape of the silicate core being confocal to that of the ice mantle. We show that nonconfocality of the spheroidal core and mantle boundaries changes fundamentally the wavelength dependence of the polarization within the 10-µm silicate band and affects significantly the polarization within the 3-µm water ice band, while the extinction profiles of these bands remain essentially unchanged. Since the results have been obtained for a theoretical model, we discuss their applicability and significance for cosmic dust grains.

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Authors and Affiliations

  1. Sobolev Astronomical Institute, St. Petersburg State University, Universitetskii pr. 28, St. Petersburg, 198504, Russia

    M. S. Prokopjeva & V. B. Il’in

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  1. M. S. Prokopjeva
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  2. V. B. Il’in
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Correspondence to V. B. Il’in.

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Original Russian Text © M.S. Prokopjeva, V.B. Il’in, 2007, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2007, Vol. 33, No. 10, pp. 784–791.

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Prokopjeva, M.S., Il’in, V.B. Polarization in IR bands and the structure of cosmic dust grains. Astron. Lett. 33, 699–705 (2007). https://doi.org/10.1134/S1063773707100076

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  • DOI: https://doi.org/10.1134/S1063773707100076

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