Table 1
Grain compositions, structures, and volume densities in g cm−3 as described in Sect. 2.1.
| Name | Material 1 | Material 2 | Material 3 | Structure | Density | Spectral index | References |
|---|---|---|---|---|---|---|---|
| a-Sil | a-Sil | Compact | 2.95 | 2.10 | 1 | ||
| a-C | a-C | Compact | 1.60 | 1.30 | 2 | ||
| a-C:H | a-C:H | Compact | 1.30 | 2.00 | 2 | ||
| Mix 1 | 2/3 a-Sil | 1/3 a-C | Compact | 2.50 | 1.35 | 1, 2 | |
| Mix 2 | 2/3 a-Sil | 1/3 a-C:H | Compact | 2.40 | 2.00 | 1, 2 | |
| Mix 1:50 | 2/3 a-Sil | 1/3 a-C | Porous 50% | 1.25 | 1.30 | 1, 2 | |
| Mix 1:ice | 30% a-Sil | 15% a-C | 55% ice mantle | Compact | 1.68 | 1.35 | 1, 2, 3 |
| Mix 3 | 21% a-Sil | 79% a-C | Compact | 1.88 | 1.30 | 1, 2, 4 | |
| Mix 3:ice | 8% a-Sil | 30% a-C | 62% ice mantle | Compact | 1.34 | 1.30 | 1, 2, 3, 4 |
Notes. The amount of each material composing a grain is given as a fraction of volume. The spectral index column refers to the asymptotic values of the absorption efficiency spectral indices as defined in Sect. 3.1. The references correspond to where the optical constants are defined.
References.1: Köhler et al. (2014), 2: Jones (2012a,b,c), 3: Warren (1984), 4: Pollack et al. (1994).
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