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Laboratory simulations of the Vis-NIR spectra of comet 67P using sub-µm sized cosmochemical analogues

Rousseau, Batiste and Erard, S. and Beck, P. and Quirico, E. and Schmitt, B. and Brissaud, O. and Montes-Hernandez, German and Capaccioni, F. and Filacchione, G. and Bockelee-Morvan, D. and Leyrat, C. and Ciarniello, M. and Raponi, A. and Kappel, David and Arnold, Gabriele and Moroz, Liubov and Palomba, E. and Tosi, F. (2018) Laboratory simulations of the Vis-NIR spectra of comet 67P using sub-µm sized cosmochemical analogues. Icarus, 306, pp. 306-318. Elsevier. DOI: 10.1016/j.icarus.2017.10.015 ISSN 0019-1035

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Official URL: https://doi.org/10.1016/j.icarus.2017.10.015

Abstract

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 micron, excluding the organics band centred at 3.2 micron. 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.

Item URL in elib:https://elib.dlr.de/124877/
Document Type:Article
Title:Laboratory simulations of the Vis-NIR spectra of comet 67P using sub-µm sized cosmochemical analogues
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rousseau, BatisteLESIAUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Beck, P.Laboratoire de Planétologie de Grenoble (LPG) - University Joseph Fourier Grenoble, Grenboble, FranceUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIED
Brissaud, O.grenoble planetology laboratoryUNSPECIFIED
Montes-Hernandez, GermanISTerre - Universite Grenoble AlpesUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Ciarniello, M.INAF-IASF, ItalyUNSPECIFIED
Raponi, A.INAF-IASF, ItalyUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.dehttps://orcid.org/0000-0002-0518-5548
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Moroz, LiubovLjuba.Moroz (at) dlr.deUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Date:15 May 2018
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:306
DOI :10.1016/j.icarus.2017.10.015
Page Range:pp. 306-318
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Comets Comets nucleus Comets composition Spectroscopy Experimental techniques
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:12 Dec 2018 10:50
Last Modified:06 Sep 2019 15:26

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