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Reflectance spectroscopy of natural organic solids, iron sulfides and their mixtures as refractory analogues for Rosetta/VIRTIS' surface composition analysis of 67P/CG

Moroz, Liubov and Markus, Kathrin and Arnold, Gabriele and Henckel, Daniela and Kappel, David and Schade, U. and Rousseau, Batiste and Quirico, E. and Schmitt, B. and Capaccioni, F. and Bockelee-Morvan, D. and Filacchione, G. and Erard, S. and Leyrat, C. (2016) Reflectance spectroscopy of natural organic solids, iron sulfides and their mixtures as refractory analogues for Rosetta/VIRTIS' surface composition analysis of 67P/CG. In: Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC), 48, 116.21-116.21. Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC), 16.-21. Oct. 2016, Pasadena, CA, USA.

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Official URL: https://aas.org/meetings/dps48

Abstract

Analysis of 0.25-5 µm reflectance spectra provided by the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS) onboard Rosetta orbiter revealed that the surface of 67P/CG is dark from the near-UV to the IR and is enriched in refractory phases such as organic and opaque components. The broadness and complexity of the ubiquitous absorption feature around 3.2 µm suggest a variety of cometary organic constituents. For example, complex hydrocarbons (aliphatic and polycyclic aromatic) can contribute to the feature between 3.3 and 3.5 µm and to the low reflectance of the surface in the visible. Here we present the 0.25-5 µm reflectance spectra of well-characterized terrestrial hydrocarbon materials (solid oil bitumens, coals) and discuss their relevance as spectral analogues for a hydrocarbon part of 67P/CG's complex organics. However, the expected low degree of thermal processing of cometary hydrocarbons (high (H+O+N+S)/C ratios and low carbon aromaticities) suggests high IR reflectance, intense 3.3-3.5 µm absorption bands and steep red IR slopes that are not observed in the VIRTIS spectra. Fine-grained opaque refractory phases (e.g., iron sulfides, Fe-Ni alloys) intimately mixed with other surface components are likely responsible for the low IR reflectance and low intensities of absorption bands in the VIRTIS spectra of the 67P/CG surface. In particular, iron sulfides are common constituents of cometary dust, "cometary" chondritic IDPs, and efficient darkening agents in primitive carbonaceous chondrites. Their effect on reflectance spectra of an intimate mixture is strongly affected by grain size. We report and discuss the 0.25-5 µm reflectance spectra of iron sulfides (meteoritic troilite and several terrestrial pyrrhotites) ground and sieved to various particle sizes. In addition, we present reflectance spectra of several intimate mixtures of powdered iron sulfides and solid oil bitumens. Based on the reported laboratory data, we discuss the ability of iron sulfides to suppress absorption bands of other cometary refractory components and to affect the spectral slopes and reflectance values of the 67P/CG surface at different wavelengths from the near-UV to the IR.

Item URL in elib:https://elib.dlr.de/107191/
Document Type:Conference or Workshop Item (Poster)
Title:Reflectance spectroscopy of natural organic solids, iron sulfides and their mixtures as refractory analogues for Rosetta/VIRTIS' surface composition analysis of 67P/CG
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Moroz, LiubovLjuba.Moroz (at) dlr.deUNSPECIFIED
Markus, KathrinWestfälische Wilhelms-Universität MünsterUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Henckel, DanielaDaniela.Henckel (at) dlr.deUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.deUNSPECIFIED
Schade, U.BESSY GmbHUNSPECIFIED
Rousseau, BatisteLESIAUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Date:17 October 2016
Journal or Publication Title:Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC)
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:48
Page Range:116.21-116.21
Status:Published
Keywords:Rosetta, 67P, Composition
Event Title:Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC)
Event Location:Pasadena, CA, USA
Event Type:international Conference
Event Dates:16.-21. Oct. 2016
Organizer:American Astronomical Society
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
Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Asteroids and Comets
Deposited By: Kappel, David
Deposited On:28 Oct 2016 08:55
Last Modified:31 Jul 2019 20:04

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