Comparison of space weathering spectral changes induced by solar wind and micrometeoroid impacts using ion- and femtosecond-laser-irradiated olivine and pyroxene

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http://hdl.handle.net/10138/335664

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Chrbolková , K , Brunetto , R , Ďurech , J , Kohout , T , Mizohata , K , Malý , P , Dědič , V , Lantz , C , Penttilä , A , Trojánek , F & Maturilli , A 2021 , ' Comparison of space weathering spectral changes induced by solar wind and micrometeoroid impacts using ion- and femtosecond-laser-irradiated olivine and pyroxene ' , Astronomy & Astrophysics , vol. 654 , no. A&A , 143 . https://doi.org/10.1051/0004-6361/202140372

Titel: Comparison of space weathering spectral changes induced by solar wind and micrometeoroid impacts using ion- and femtosecond-laser-irradiated olivine and pyroxene
Författare: Chrbolková, Kateřina; Brunetto, Rosario; Ďurech, Josef; Kohout, Tomáš; Mizohata, Kenichiro; Malý, Petr; Dědič, Václav; Lantz, Cateline; Penttilä, Antti; Trojánek, František; Maturilli, Alessandro
Upphovmannens organisation: Department of Geosciences and Geography
Geology and Geophysics
Department of Physics
Planetary-system research
Materials Physics
Datum: 2021-10-22
Språk: eng
Sidantal: 17
Tillhör serie: Astronomy & Astrophysics
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202140372
Permanenta länken (URI): http://hdl.handle.net/10138/335664
Abstrakt: Context. Space weathering is a process that changes the surface of airless planetary bodies. Prime space weathering agents are solar wind irradiation and micrometeoroid bombardment. These processes alter planetary reflectance spectra and often modify their compositional diagnostic features. Aims. In this work we focused on simulating and comparing the spectral changes caused by solar wind irradiation and by micrometeoroid bombardment to gain a better understanding of these individual space weathering processes. Methods. We used olivine and pyroxene pellets as proxies for planetary materials. To simulate solar wind irradiation we used hydrogen, helium, and argon ions with energies from 5 to 40 keV and fluences of up to 10(18) particles cm(-2). To simulate micrometeoroid bombardment we used individual femtosecond laser pulses. We analysed the corresponding evolution of different spectral parameters, which we determined by applying the Modified Gaussian Model, and we also conducted principal component analysis. Results. The original mineralogy of the surface influences the spectral evolution more than the weathering agent, as seen from the diverse evolution of the spectral slope of olivine and pyroxene upon irradiation. The spectral slope changes seen in olivine are consistent with observations of A-type asteroids, while the moderate to no slope changes observed in pyroxene are consistent with asteroid (4) Vesta. We also observed some differences in the spectral effects induced by the two weathering agents. Ions simulating solar wind have a smaller influence on longer wavelengths of the spectra than laser irradiation simulating micrometeoroid impacts. This is most likely due to the different penetration depths of ions and laser pulses. Our results suggest that in some instances it might be possible to distinguish between the contributions of the two agents on a weathered surface.
Subject: 115 Astronomy, Space science
planets and satellites: surfaces
solar wind
meteorites, meteors, meteoroids
methods: data analysis
techniques: spectroscopic
MODIFIED GAUSSIAN MODEL
NEAR-EARTH
DOMINATED ASTEROIDS
IRON NANOPARTICLES
REFLECTANCE
SIMULATION
ITOKAWA
SURFACE
BELT
MINERALOGY
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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