Abstract
The infrared properties of dust in space, as inferred from infrared observations at low to moderate spectral resolution at wavelengths ≲30 μm are summarized. Condensates at high temperature: featureless material and silicon carbide; moderate temperature: silicates; and low temperature — ices are briefly discussed. Strong band emission from as yet unknown species has been detected in a variety of objects. Episodes of rapid dust formation have been recorded in the infrared spectra of certain eruptive variable stars, including classical novae. Observations of this class of objects promises to provide information on grain nucleation and growth.
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