Space Weathering Trends Revealed by Principal Component Analysis: Looking Beyond the Slope

Details Space Weathering Trends Revealed by Principal Component Analysis: Looking Beyond the Slope Space Weathering Trends Revealed by Principal Component Analysis: Looking Beyond the Slope

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.6004b&link_type=abstract

American Astronomical Society, DPS meeting #42, #60.04; Bulletin of the American Astronomical Society, Vol. 42, p.1086

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a quantitative analysis of space weathering trends as measured in the laboratory [1], as determined through models [2], and as measured on asteroids in situ [3,4]. Our first step is to remove the slope from all spectra so as to analyze the effects of weathering on spectral features, such as the strength of the 1- and 2-micron absorption bands. Thus we perform a slope-free analysis. We compare the `beyond the slope’ effects of space weathering trends to the natural dispersion present within principal component analyses [5, 6] used for assignment of asteroid spectra to taxonomic classes. We find that after spectral slope is removed, the remaining space weathering effects create trends in principal component space that mimic important dimensions seen within the dispersion of the asteroid population as a whole. (Note the asteroid analysis is similarly performed after spectral slope is removed.) Quantitatively our analysis shows that space weathering effects, independent of spectral slope, are consistent with the transition from Q- to Sq- to S-type asteroids as classified in the Bus-DeMeo taxonomy [6].
[1]Strazzulla, G. et al. Icarus 174, 31-35 (2005). [2] Shkuratov, Y. et al. Icarus 137, 235-246 (1999). [3] Chapman, C. MAPS 31, 699-725 (1996). [4] Clark, B. et al. MAPS 36, 1617-1637 (2001). [5] Bus, S. J. MIT Ph.D. Thesis (1999). [6] DeMeo et al. Icarus 202, 160-180 (2009).

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