Mathematics – Logic
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21a..06d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P21A-06
Mathematics
Logic
6205 Asteroids
Scientific paper
Recent measurements by the Near Earth Asteroid Rendezvous (NEAR) x-ray spectrometer system (XRS) have shown the surface of 433 Eros to be depleted in sulfur. This is a surprising result, as data from the XRS describes a surface composition with elemental ratios (Mg:Si, Al:Si, Fe:Si, and Ca:Si) that are consistent with ratios for ordinary chondritic (OC) meteorites found on the Earth. It has been postulated that weathering of the surface may be the source of this discrepancy. We have simulated, in the laboratory, the contribution of two weathering mechanisms: solar-wind bombardment and micrometeorite impact. We will present the results from a series of experiments on the irradiation of FeS by 1 keV H+, 4 keV He+, 4 keV Ar+, simulating the solar wind, and nanosecond excimer laser pulses as an analog to micrometeoric bombardment. All experiments were done in ultra-high vacuum, an environment similar to Eros, and sulfur depletion was quantified in-situ using X-ray photoelectron spectroscopy. Scanning electron microscopy was performed ex- situ to provide a visual indication of morphological change. We find that the most efficient mechanism for sulfur depletion is a combination of micrometeorite bombardment and solar wind sputtering.
Baragiola Raúl A.
Chang Wonkeun
Dukes Catherine A.
Loeffler Mark J.
McFadden Lucy-Ann A.
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