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  The morphological, elastic, and electric properties of dust aggregates in comets: A close look at COSIMA/Rosetta’s data on dust in comet 67P/Churyumov-Gerasimenko

Kimura, H., Hilchenbach, M., Merouane, S., Paquette, J., & Stenzel, O. J. (2020). The morphological, elastic, and electric properties of dust aggregates in comets: A close look at COSIMA/Rosetta’s data on dust in comet 67P/Churyumov-Gerasimenko. Planetary and Space Science, 181: 104825. doi:10.1016/j.pss.2019.104825.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7C45-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7C46-2
Genre: Journal Article

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 Creators:
Kimura, Hiroshi1, Author
Hilchenbach, Martin2, Author              
Merouane, Sihane2, Author              
Paquette, John2, Author              
Stenzel, Oliver Joachim2, Author              
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Comets: general Comets: individual (67P/Churyumov-Gerasimenko) Meteorites Meteors Meteoroids Protoplanetary disks
 MPIS_PROJECTS: ROSETTA: COSIMA
 Abstract: The Cometary Secondary Ion Mass Analyzer (COSIMA) onboard ESA’s Rosetta orbiter has revealed that dust particles in the coma of comet 67P/Churyumov-Gerasimenko are aggregates of small grains. We study the morphological, elastic, and electric properties of dust aggregates in the coma of comet 67P/Churyumov-Gerasimenko using optical microscopic images taken by the COSIMA instrument. Dust aggregates in COSIMA images are well represented as fractals in harmony with morphological data from MIDAS (Micro-Imaging Dust Analysis System) and GIADA (Grain Impact Analyzer and Dust Accumulator) onboard Rosetta. COSIMA’s images, together with the data from the other Rosetta’s instruments such as MIDAS and GIADA do not contradict the so-called rainout growth of -sized particles in the solar nebula. The elastic and electric properties of dust aggregates measured by COSIMA suggest that the surface chemistry of cometary dust is well represented as carbonaceous matter rather than silicates or ices, consistent with the mass spectra, and that organic matter is to some extent carbonized by solar radiation, as inferred from optical and infrared observations of various comets. Electrostatic lofting of cometary dust by intense electric fields at the terminator of its parent comet is unlikely, unless the surface chemistry of the dust changes from a dielectric to a conductor. Our findings are not in conflict with our current understanding of comet formation and evolution, which begin with the accumulation of condensates in the solar nebula and follow with the formation of a dust mantle in the inner solar system.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.pss.2019.104825
 Degree: -

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Title: Planetary and Space Science
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 181 Sequence Number: 104825 Start / End Page: - Identifier: ISSN: 0032-0633
CoNE: https://pure.mpg.de/cone/journals/resource/954925434422