Table 2
Overview of the various models investigated in this work.
| Model | Tunnelling diffusion | Thermal diffusion | Ed/Eb(a) | Abstraction reactions | Gas-grain model | Cosmic-ray ionisation rate | Other modifications |
|---|---|---|---|---|---|---|---|
| Chemical variation | |||||||
| 1D-1(†) | ✗ | ✓ | 0.55 | ✓ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-2(★) | ✗ | ✓ | 0.55 | ✗ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-3 | ✓ | ✓ | 0.55 | ✓ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-4 | ✓ | ✓ | 0.55 | ✗ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-4-1(★) | ✓ | ✓ | 0.55 | ✗ | 3 phases | 1.3 × 10−17 s−1 | 4 active surface layers |
| 1D-4-2(★) | ✓ | ✓ | 0.55 | ✗ | 2 phases | 1.3 × 10−17 s−1 | |
| 1D-5(†) | ✗ | ✓ | 0.2 | ✓ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-6(★) | ✗ | ✓ | 0.2 | ✗ | 3 phases | 1.3 × 10−17 s−1 | |
| 1D-7(†) | ✓ | ✓ | 0.55 | ✓ | 2 phases | 1.3 × 10−17 s−1 | |
| 1D-8(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | 1.3 × 10−17 s−1 | No reactive desorption for reactions with 2 products |
| 1D-9(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | 1.3 × 10−17 s−1 | Reduced EA (b) for deuterated species by 200 K |
| 1D-10(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | 1.3 × 10−17 s−1 | Hform(XH) = Hform(XD)(c) (see Table A.1) |
| Physical variation | |||||||
| 1D-11(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | 1.3 x 10−17 s−1 | Decreased Tgas by 1K throughout the core |
| 1D-12(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | ℒ-model(d) | |
| 1D-13(†) | ✓ | ✓ | 0.55 | ✓ | 3 phases | Dynamic mechanism for CR- desorption(e) | |
Notes. Only the chemical and physical properties that vary between models are listed. The 1D-4 model is the fiducial model presented in Sect. 3.1. (★) Models that take the 1D-4 model as starting point. (†) Models that take the 1D-3 model, including the abstraction reactions, as a starting point. (a) Ed is the diffusion energy and Eb the binding energy. (b) EA is the activation energy of the reaction. (c) Hform(XH) is the formation enthalpy of a non-deuterated species and Hform (XD) is the formation enthalpy of a deuterated species. (d)From Padovani et al. (2018). (e)From Sipilä et al. (2021).
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