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Calcium pyroxenes at Mercurian surface temperatures: investigation of in-situ emissivity spectra and thermal expansion.

Ferrari, Sabrina and Nestola, F. and Helbert, J. and Maturilli, A. and D´Amore, M. and Alvaro, M. and Domeneghetti, M.C. and Massironi, M. and Hiesinger, H. (2013) Calcium pyroxenes at Mercurian surface temperatures: investigation of in-situ emissivity spectra and thermal expansion. 2013 American Geophysical Union Fall Meeting, 08-13 Dec 2013, San Francisco, CA.

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Abstract

The European Space Agency and Japan Aerospace Agency mission to Mercury, named BepiColombo, will carry on board the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) that will be able to provide surface Thermal Infra-Red (TIR) emissivity spectra from 7 to 14 µm. This range of wavelengths is very useful to identify the fine-scale structural properties of several silicates. For mineral families as pyroxenes, the emissivity peak positions are good indicators of the composition. A complication in the interpretation of MERTIS data could arise from the extreme daily surface temperature range of Mercury (70 to 725 K) that significantly affects the crystal structure and density of minerals and consequently should affect the TIR spectral signature of each single mineral present on the surface of the planet. In preparation for the MERTIS data analysis, we are extensively investigating at high temperatures conditions several mineral phases potentially detectable on the surface of Mercury. Two C2/c augitic pyroxenes, with constant calcium content and very different magnesium to iron ratio, were studied by in situ high-temperature thermal infrared spectroscopy (up to 750 K) and in situ high-temperature single-crystal X-ray diffraction (up to 770 K). The emissivity spectra of the two samples show similar band center shifts of the main three bands toward lower wavenumbers with increasing temperature. Our results indicate that the center position of bands 1 and 2 is strictly dependent on temperature, whereas the center position of band 3 is a strong function of the composition regardless the temperature. These data suggest that MERTIS spectra will be able to provide indications of C2/c augitic pyroxene with different magnesium contents and will allow a correct interpretation independently on the spectra acquisition temperature.

Item URL in elib:https://elib.dlr.de/87111/
Document Type:Conference or Workshop Item (Poster)
Title:Calcium pyroxenes at Mercurian surface temperatures: investigation of in-situ emissivity spectra and thermal expansion.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ferrari, Sabrinasabrina.ferrari (at) dlr.deUNSPECIFIED
Nestola, F.fabrizio.nestola (at) unipd.itUNSPECIFIED
Helbert, J.joern.helbert (at) dlr.deUNSPECIFIED
Maturilli, A.alessandro.maturilli (at) dlr.deUNSPECIFIED
D´Amore, M.Mario.Damore (at) dlr.deUNSPECIFIED
Alvaro, M.matteo.alvaro (at) unipd.itUNSPECIFIED
Domeneghetti, M.C.chiara.domeneghetti (at) unipv.itUNSPECIFIED
Massironi, M.matteo.massironi (at) unipd.itUNSPECIFIED
Hiesinger, H.Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, GermanyUNSPECIFIED
Date:9 December 2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:high temperature, TIR emissivity, thermal expansion, clinopyroxenes, Mercury
Event Title:2013 American Geophysical Union Fall Meeting
Event Location:San Francisco, CA
Event Type:international Conference
Event Dates:08-13 Dec 2013
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 - Vorhaben BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Ferrari, Sabrina
Deposited On:06 Jan 2014 07:48
Last Modified:31 Jul 2019 19:44

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