Batiste Rousseau, Stéphane Erard, P. Beck, Eric Quirico, B. Schmitt, O. Brissaud, G. Montes-Hernandez, F. Capaccioni, Gianrico Filacchione, Dominique Bockelee-Morvan, C. Leyrat, M. Ciarniello, Andrea Raponi, David Kappel, G. Arnold, L. V. Moroz, Ernesto Palomba, Federico Tosi
- Laboratory spectral measurements of relevant analogue materials were performed in the framework of the Rosetta mission in order to explain the surface spectral properties of comet 67P. Fine powders of coal, iron sulphides, silicates and their mixtures were prepared and their spectra measured in the Vis-IR range. These spectra are compared to a reference spectrum of 67P nucleus obtained with the VIRTIS/Rosetta instrument up to 2.7 mu m, excluding the organics band centred at 3.2 mu m. The species used are known to be chemical analogues for cometary materials which could be present at the surface of 67P. Grain sizes of the powders range from tens of nanometres to hundreds of micrometres. Some of the mixtures studied here actually reach the very low reflectance level observed by VIRTIS on 67P. The best match is provided by a mixture of sub-micron coal, pyrrhotite, and silicates. Grain sizes are in agreement with the sizes of the dust particles detected by the GIADA, MIDAS and COSIMA instruments on board Rosetta. The coal used in theLaboratory spectral measurements of relevant analogue materials were performed in the framework of the Rosetta mission in order to explain the surface spectral properties of comet 67P. Fine powders of coal, iron sulphides, silicates and their mixtures were prepared and their spectra measured in the Vis-IR range. These spectra are compared to a reference spectrum of 67P nucleus obtained with the VIRTIS/Rosetta instrument up to 2.7 mu m, excluding the organics band centred at 3.2 mu m. The species used are known to be chemical analogues for cometary materials which could be present at the surface of 67P. Grain sizes of the powders range from tens of nanometres to hundreds of micrometres. Some of the mixtures studied here actually reach the very low reflectance level observed by VIRTIS on 67P. The best match is provided by a mixture of sub-micron coal, pyrrhotite, and silicates. Grain sizes are in agreement with the sizes of the dust particles detected by the GIADA, MIDAS and COSIMA instruments on board Rosetta. The coal used in the experiment is responsible for the spectral slope in the visible and infrared ranges. Pyrrhotite, which is strongly absorbing, is responsible for the low albedo observed in the NIR. The darkest components dominate the spectra, especially within intimate mixtures. Depending on sample preparation, pyrrhotite can coat the coal and silicate aggregates. Such coating effects can affect the spectra as much as particle size. In contrast, silicates seem to play a minor role. (c) 2017 Elsevier Inc. All rights reserved.…
MetadatenAuthor details: | Batiste RousseauORCiD, Stéphane ErardORCiD, P. Beck, Eric QuiricoORCiD, B. Schmitt, O. Brissaud, G. Montes-Hernandez, F. Capaccioni, Gianrico FilacchioneORCiD, Dominique Bockelee-MorvanORCiD, C. Leyrat, M. Ciarniello, Andrea RaponiORCiD, David KappelORCiDGND, G. Arnold, L. V. Moroz, Ernesto PalombaORCiD, Federico TosiORCiD |
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DOI: | https://doi.org/10.1016/j.icarus.2017.10.015 |
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ISSN: | 0019-1035 |
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ISSN: | 1090-2643 |
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Title of parent work (English): | Icarus : international journal of solar system studies |
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Publisher: | Elsevier |
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Place of publishing: | San Diego |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/10/14 |
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Publication year: | 2018 |
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Creating corporation: | VIRTIS Team |
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Release date: | 2021/12/01 |
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Tag: | Comets; Comets composition; Comets nucleus; Experimental techniques; Spectroscopy |
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Volume: | 306 |
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Number of pages: | 13 |
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First page: | 306 |
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Last Page: | 318 |
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Funding institution: | Luft- and Raumfahrt (DLR-Germany); NASA (USA) Rosetta Program; Science and Technology Facilities Council (UK)Science & Technology Facilities Spatiales; DLRHelmholtz AssociationGerman Aerospace Centre (DLR); [654208] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
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| 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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