Effects of heliocentric distance on polarisation of comet C/2010 E6 (STEREO)

Nežič, Rok; Bagnulo, S.; Jones, G. H.

doi:10.5194/epsc2020-817

Cited by 1 publication

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“…The study of the NPB and maximum of the DLP is an extended technique for characterizing dust particles in astronomical bodies like cometary coma (e.g., Lumme & Muinonen 1993;Kolokolova et al 2007;Moreno et al 2007;Hadamcik & Levasseur-Regourd 2009;Zubko et al 2013bZubko et al , 2016Kiselev et al 2015;Muinonen et al 2015;Nezic et al 2021) or protoplanetary and debris disks (Bastien & Menard 1988;Fischer et al 1994;Kataoka et al 2015Kataoka et al , 2017Kirchslager & Wolf 2014;Canovas et al 2015Canovas et al , 2016Esposito et al 2018;Ohashi et al 2018;Ren et al 2019). We note that the NPB is known as polarization reversal within the stellar disks community.…”

Section: Characterizing Size Grains From the Analysis Of The Degree O...mentioning

confidence: 97%

Retrieving Dust Grain Sizes from Photopolarimetry: An Experimental Approach

Muñoz

Frattin

Jardiel

et al. 2021

ApJS

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We present the experimental phase function, degree of linear polarization (DLP), and linear depolarization (δ L ) curves of a set of forsterite samples representative of low-absorbing cosmic dust particles. The samples are prepared using state-of-the-art size-segregating techniques to obtain narrow size distributions spanning a broad range of the scattering size parameter domain. We conclude that the behavior of the phase function at the side-and back-scattering regions provides information on the size regime, the position and magnitude of the maximum of the DLP curve are strongly dependent on particle size, the negative polarization branch is mainly produced by particles with size parameters in the ∼6 to ∼20 range, and the δ L is strongly dependent on particle size at all measured phase angles except for the exact backward direction. From a direct comparison of the experimental data with computations for spherical particles, it becomes clear that the use of the spherical model for simulating the phase function and DLP curves of irregular dust produces dramatic errors in the retrieved composition and size of the scattering particles: The experimental phase functions are reproduced by assuming unrealistically high values of the imaginary part of the refractive index. The spherical model does not reproduce the bell-shaped DLP curve of dust particles with sizes in the resonance and/or geometric optics size domain. Thus, the use of the Mie model for analyzing polarimetric observations might prevent locating dust particles with sizes of the order of or larger than the wavelength of the incident light.

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