Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues
Mercury’s peculiar orbit around the Sun (3:2 spin–orbit resonance) and lack of atmosphere result in one the widest temperature ranges experienced at the surface of a planetary body in the solar system. Temperature variations affect the physical and, therefore, spectral properties of minerals to vary...
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ftmdpi:oai:mdpi.com:/2075-163X/13/2/250/ 2023-08-20T04:08:38+02:00 Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues Nicolas Bott Rosario Brunetto Alain Doressoundiram Cristian Carli Fabrizio Capaccioni Yves Langevin Davide Perna François Poulet Giovanna Serventi Maria Sgavetti Francesco Vetere Diego Perugini Cristina Pauselli Ferenc Borondics Christophe Sandt agris 2023-02-10 application/pdf https://doi.org/10.3390/min13020250 EN eng Multidisciplinary Digital Publishing Institute Mineral Exploration Methods and Applications https://dx.doi.org/10.3390/min13020250 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 13; Issue 2; Pages: 250 mercury spectroscopy temperature composition plagioclase glasses Text 2023 ftmdpi https://doi.org/10.3390/min13020250 2023-08-01T08:44:32Z Mercury’s peculiar orbit around the Sun (3:2 spin–orbit resonance) and lack of atmosphere result in one the widest temperature ranges experienced at the surface of a planetary body in the solar system. Temperature variations affect the physical and, therefore, spectral properties of minerals to varying degrees; thus, it is crucial to study them in the context of the upcoming arrival of the BepiColombo spacecraft in Mercury orbit in the fall of 2025. In this work, we heated and cooled analog materials (plagioclase and volcanic glasses) at temperatures representative of the hermean surface. With our experimental setup, we could measure near-infrared (1.0–3.5 μm) and thermal infrared (2.0–14.3 μm) reflectance spectra of our analogs at various temperatures during a heating (25–400 ∘C) or cooling cycle (−125–25 ∘C), allowing us to follow the evolution of the spectral properties of minerals. We also collected reflectance spectra in the visible domain (0.47–14.3 μm) before and after heating. In the visible spectra, we identified irreversible changes in the spectral slope (reddening) and the reflectance (darkening or brightening) that are possibly associated with oxidation, whereas the temperature had reversible effects (e.g., band shifts of from ten to a hundred nanometers towards greater wavelengths) on the infrared spectral features of our samples. These reversible changes are likely caused by the crystal lattice dilatation during heating. Finally, we took advantage of the water and ice present on/in our samples to study the different components of the absorption band at 3.0 μm when varying temperatures, which may be useful as a complement to future observations of the north pole of Mercury. The wavelength ranges covered by our measurements are of interest for the SIMBIO-SYS and MERTIS instruments, which will map the mineralogy of Mercury’s surface from spring 2026, and for which we selected useful spectral parameters that are proxies of surface temperature variations. Text North Pole MDPI Open Access Publishing North Pole Minerals 13 2 250 |
institution |
Open Polar |
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MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
mercury spectroscopy temperature composition plagioclase glasses |
spellingShingle |
mercury spectroscopy temperature composition plagioclase glasses Nicolas Bott Rosario Brunetto Alain Doressoundiram Cristian Carli Fabrizio Capaccioni Yves Langevin Davide Perna François Poulet Giovanna Serventi Maria Sgavetti Francesco Vetere Diego Perugini Cristina Pauselli Ferenc Borondics Christophe Sandt Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
topic_facet |
mercury spectroscopy temperature composition plagioclase glasses |
description |
Mercury’s peculiar orbit around the Sun (3:2 spin–orbit resonance) and lack of atmosphere result in one the widest temperature ranges experienced at the surface of a planetary body in the solar system. Temperature variations affect the physical and, therefore, spectral properties of minerals to varying degrees; thus, it is crucial to study them in the context of the upcoming arrival of the BepiColombo spacecraft in Mercury orbit in the fall of 2025. In this work, we heated and cooled analog materials (plagioclase and volcanic glasses) at temperatures representative of the hermean surface. With our experimental setup, we could measure near-infrared (1.0–3.5 μm) and thermal infrared (2.0–14.3 μm) reflectance spectra of our analogs at various temperatures during a heating (25–400 ∘C) or cooling cycle (−125–25 ∘C), allowing us to follow the evolution of the spectral properties of minerals. We also collected reflectance spectra in the visible domain (0.47–14.3 μm) before and after heating. In the visible spectra, we identified irreversible changes in the spectral slope (reddening) and the reflectance (darkening or brightening) that are possibly associated with oxidation, whereas the temperature had reversible effects (e.g., band shifts of from ten to a hundred nanometers towards greater wavelengths) on the infrared spectral features of our samples. These reversible changes are likely caused by the crystal lattice dilatation during heating. Finally, we took advantage of the water and ice present on/in our samples to study the different components of the absorption band at 3.0 μm when varying temperatures, which may be useful as a complement to future observations of the north pole of Mercury. The wavelength ranges covered by our measurements are of interest for the SIMBIO-SYS and MERTIS instruments, which will map the mineralogy of Mercury’s surface from spring 2026, and for which we selected useful spectral parameters that are proxies of surface temperature variations. |
format |
Text |
author |
Nicolas Bott Rosario Brunetto Alain Doressoundiram Cristian Carli Fabrizio Capaccioni Yves Langevin Davide Perna François Poulet Giovanna Serventi Maria Sgavetti Francesco Vetere Diego Perugini Cristina Pauselli Ferenc Borondics Christophe Sandt |
author_facet |
Nicolas Bott Rosario Brunetto Alain Doressoundiram Cristian Carli Fabrizio Capaccioni Yves Langevin Davide Perna François Poulet Giovanna Serventi Maria Sgavetti Francesco Vetere Diego Perugini Cristina Pauselli Ferenc Borondics Christophe Sandt |
author_sort |
Nicolas Bott |
title |
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
title_short |
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
title_full |
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
title_fullStr |
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
title_full_unstemmed |
Effects of Temperature on Visible and Infrared Spectra of Mercury Minerals Analogues |
title_sort |
effects of temperature on visible and infrared spectra of mercury minerals analogues |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/min13020250 |
op_coverage |
agris |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
Minerals; Volume 13; Issue 2; Pages: 250 |
op_relation |
Mineral Exploration Methods and Applications https://dx.doi.org/10.3390/min13020250 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min13020250 |
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Minerals |
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13 |
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250 |
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