The Ch-class asteroids: Connecting a visible taxonomic class to a 3-µm band shape

Author(s)

Andrew S. Rivkin, Cristina A. Thomas, Ellen S. Howell, Joshua P. Emery

Publication Year

2015

Journal

The Astronomical Journal 150: 198

DOI

doi:10.1088/0004-6256/150/6/198

Description

Asteroids belonging to the Ch spectral taxonomic class are defined by the presence of an absorption near 0.7 μm, which is interpreted as due to Fe-bearing phyllosilicates. Phyllosilicates also cause strong absorptions in the 3 μm region, as do other hydrated and hydroxylated minerals and H2O ice. Over the past decade, spectral observations have revealed different 3 μm band shapes in the asteroid population. Although a formal taxonomy is yet to be fully established, the "Pallas-type" spectral group is most consistent with the presence of phyllosilicates. If Ch class and Pallas type are both indicative of phyllosilicates, then all Ch-class asteroids should also be Pallas-type. In order to test this hypothesis, we obtained 42 observations of 36 Ch-class asteroids in the 2 to 4 μm spectral region. We found that 88% of the spectra have 3 μm band shapes most consistent with the Pallas-type group. This is the first asteroid class for which such a strong correlation has been found. Because the Ch class is defined by the presence of an absorption near 0.7 μm, this demonstrates that the 0.7 μm band serves not only as a proxy for the presence of a band in the 3 μm region, but specifically for the presence of Pallas-type bands. There is some evidence for a correlation between band depth at 2.95 μm and absolute magnitude and/or albedo. However, we find only weak correlations between 2.95 μm band depth and semimajor axis. The connection between band depths in the 0.7 and 3 μm regions is complex and in need of further investigation.

Files

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chpaper_4_arxiv2.pdf

Preprint of paper

rivkin_chpaper_tables.docx

Microsoft Word version of tables from paper

rivkin_etal_chpaper_spectratar.gz

Gzipped tarfile with spectra

spectrum_files_description.txt

Description of spectral files in tar file

Uploaded by rivkias1 on Nov. 26, 2018, 3:32 p.m.
Last modified Nov. 26, 2018, 3:41 p.m.