Experimental phase function and degree of linear polarization of cometary dust analogues

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Frattin , E , Munoz , O , Moreno , F , Nava , J , Escobar-Cerezo , J , Gomez Martin , J C , Guirado , D , Cellino , A , Coll , P , Raulin , F , Bertini , I , Cremonese , G , Lazzarin , M , Naletto , G & La Forgia , F 2019 , ' Experimental phase function and degree of linear polarization of cometary dust analogues ' , Monthly Notices of the Royal Astronomical Society , vol. 484 , no. 2 , pp. 2198-2211 . https://doi.org/10.1093/mnras/stz129

Title: Experimental phase function and degree of linear polarization of cometary dust analogues
Author: Frattin, E.; Munoz, O.; Moreno, F.; Nava, J.; Escobar-Cerezo, J.; Gomez Martin, J. C.; Guirado, D.; Cellino, A.; Coll, P.; Raulin, F.; Bertini, I.; Cremonese, G.; Lazzarin, M.; Naletto, G.; La Forgia, F.
Contributor organization: Department of Physics
Date: 2019-04
Language: eng
Number of pages: 14
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stz129
URI: http://hdl.handle.net/10138/308471
Abstract: We present experimental phase function and degree of linear polarization curves for seven samples of cometary dust analogues namely: ground pieces of Allende, DaG521, FRO95002, and FRO99040 meteorites, Mg-rich olivine and pyroxene, and a sample of organic tholins. The experimental curves have been obtained at the IAA Cosmic Dust Laboratory at a wavelength of 520 nm covering a phase angle range from 3 degrees to 175 degrees. We also provide values of the backscattering enhancement for our cometary analogue samples. The final goal of this work is to compare our experimental curves with observational data of comets and asteroids to better constrain the nature of cometary and asteroidal dust grains. All measured phase functions present the typical behaviour for mu m-sized cosmic dust grains. Direct comparison with data provided by the OSIRIS/Rosetta camera for comet 67P/Churyumov-Gerasimenko reveals significant differences and supports the idea of a coma dominated by big chunks, larger than one micrometer. The polarization curves are qualitatively similar to ground-based observations of comets and asteroids. The position of the inversion polarization angle seems to be dependent on the composition of the grains. We find opposite dependence of the maximum of the polarization curve for grains sizes in the Rayleigh-resonance and geometric optics domains, respectively.
Subject: Scattering
LIGHT-SCATTERING
PARTICULATE SURFACES
REFLECTANCE SPECTRA
CV3 CHONDRITES
T-MATRIX
PARTICLES
STARDUST
81P/WILD-2
MINERALOGY
THOLINS
115 Astronomy, Space science
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: publishedVersion


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