Table 1
Assumed composition of the carbonaceous material in cold disc regions.
| Fraction f | Outgassing | Released | ||||
| Carbonaceous dust component | Structure | of C | Process | Temperature | Species | Percent |
|
|
||||||
| Pure carbon dust | Amorphous carbon | 0.1 | Oxidation | 1 100 | HCCO | 100 |
| Volatile organic material | Aliphatic compounds | 0.1 | Pyrolysis | 325 | CH4 | 50 |
| C4H10 | 50 | |||||
| Moderately volatile organics | Aromatic compounds | 0.1 | Evaporation | 425 | C16H10 | 100 |
| Refractory organic material | CHON | 0.6 | Pyrolysis | 425 | CH4 | 15 |
| CO | 25 | |||||
| CO2 | 20 | |||||
| C16H10 | 40 | |||||
| Others | 0.1 | |||||
Notes. The fractions of carbon bound in the different components are given with respect to the total carbon bound in the carbonaceous material, which in turn is a fraction of 0.55 of the C element abundance. For the different components, we list the gases assumed to be released by heating or oxidation and the corresponding approximate release temperatures (in K) and the relative proportions of the products.
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