Abstract
Radiative transfer models of dense clouds and protostellar envelopes rely on the availability of appropriate dust opacities, particularly as new JWST data become available. We present the model opacity known as KP5, which fits the (1–1000 μm) extinction curve measured for icy dust in dense molecular clouds by Spitzer and JCMT, and has been used by the community since 2009, but not previously published. The opacity law (absorption, scattering, and Henyey–Greenstein asymmetry parameter) includes H2O, CO, and CO2 ices, and has been shown to be well suited for models of embedded protostars.
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