10 and 20 m spectropolarimetry of the BN object

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Abstract
Spectropolarimetric observations of the BN object at 10 and 20 μm reveal a surprisingly large ratio of 20 to 10 μm polarization in the respective peaks. The results are compared with the predictions of core/mantle grain models based on graphite and ice mixtures with a variety of silicates. Except for a glassy bronzite, in which the wavelength match to the peak in the 20 μm region is very poor, all of these predict substantially smaller amounts of 20 μm polarization than is observed. It seems that either the astronomically important silicates have a particularly strong Si–O bending mode, or that the presence of impurities in ice mantles introduces large 20 μm polarization.

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