Simulation of Space Weathering by Nanosecond Pulse Laser Irradiation: Spectral Change and TEM-ESR Confirmation of Nanophase Iron Particles

Details Simulation of Space Weathering by Nanosecond Pulse Laser Irradiation: Spectral Change and TEM-ESR Confirmation of Nanophase Iron Particles Simulation of Space Weathering by Nanosecond Pulse Laser Irradiation: Spectral Change and TEM-ESR Confirmation of Nanophase Iron Particles

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278...69s&link_type=abstract

Solar System Remote Sensing, p. 69

Astronomy and Astrophysics

Astronomy

Space Weathering, Irradiation, Chondrites, Asteroids, Iron, Particulates, Lasers, Astronomical Spectroscopy, Spectra

Scientific paper

In 1975, while examining why lunar regolith becomes darker and redder with time, Bruce Hapke with colleagues advocated that the lunar soil grains should have been coated with vapor-deposited rim containing nanometer-sized iron particles. High-velocity dust impacts and/or solar wind irradiations might produce ferrous silicate vapor. This process is called 'space weathering'. However, this hypothesis had been ignored until nanophase iron particles were confirmed in lunar regolith grains by TEM. S-type asteroids, majority in asteroids, are believed to be parent bodies of ordinary chondrites, which are a large majority in meteorites. However, S-type steroids exhibit more overall depletion and reddening of spectra, and more weakening of absorption bands relative to ordinary chondrites. This spectral mismatch is also considered being caused by space weathering process. Recent observation by Galileo showed that fresh crater interior and ejecta on S-type Ida have the spectra closer to that of ordinary chondrites. Some small asteroids have intermediate spectra between S-type and Q-type (ordinary-chondrite like) spectra. NEAR's X-ray spectrometer showed that S-type 433 Eros has elemental composition close to ordinary chondrites.

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