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  Experimental Phase Function and Degree of Linear Polarization Curves of Millimeter-sized Cosmic Dust Analogs

Muñoz, O., Moreno, F., Gómez-Martín, J. C., Vargas-Martín, F., Guirado, D., Ramos, J. L., et al. (2020). Experimental Phase Function and Degree of Linear Polarization Curves of Millimeter-sized Cosmic Dust Analogs. The Astrophysical Journal Supplement Series, 247(1): 19. doi:10.3847/1538-4365/ab6851.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-39C8-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-39D2-D
Genre: Journal Article

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Muñoz, O., Author
Moreno, F., Author
Gómez-Martín, J. C., Author
Vargas-Martín, F., Author
Guirado, D., Author
Ramos, J. L., Author
Bustamante, I., Author
Bertini, I., Author
Frattin, E., Author
Markkanen, Johannes1, Author              
Tubiana, Cecilia1, Author              
Fulle, M., Author
Güttler, Carsten1, Author              
Sierks, Holger1, Author              
Rotundi, A., Author
Della Corte, V. , Author
Ivanovski, S., Author
Zakharov, V. V., Author
Bockelée-Morvan, D., Author
Blum, J., Author
Merouane, Sihane1, Author              Levasseur-Regourd, A. C., AuthorKolokolova, L., AuthorJardiel, T., AuthorCaballero, A. C., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: We present laboratory measurements of the phase functions and degree of linear polarization (DLP) curves of a selection of millimeter-sized cosmic dust analog particles. The set includes particles with similar sizes but diverse internal structure (compact and porous) and absorbing properties. The measured phase functions are found to be in all cases very different from those of micron-sized particles. They show a monotonic decrease with increasing phase angle from the back- to the side-scattering region, reaching a minimum at large phase angles before a steep increase of the forward peak. This is in stark contrast to the phase functions of micron-sized particles, which are rather flat at low and intermediate phase angles. The maximum of the DLP for millimeter-sized compact particles is shifted toward larger phase angles (~130°) compared to that of micron-sized particles (~90°). Porosity plays an important role in the measured DLP curves: the maximum significantly decreases for increasing porosity as a result of multiple scattering within the particle. Large porous particles with highly absorbing inclusions can reproduce both the OSIRIS/Rosetta phase functions and ground-based DLP observations of comet 67P/Churyumov–Gerasimenko.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/1538-4365/ab6851
 Degree: -

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Title: The Astrophysical Journal Supplement Series
Source Genre: Journal
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Publ. Info: London : IOP Publishing
Pages: - Volume / Issue: 247 (1) Sequence Number: 19 Start / End Page: - Identifier: ISSN: 0067-0049
CoNE: https://pure.mpg.de/cone/journals/resource/954922828211_1