Open Access
Table 1
Model parameters.
| Description | Symbol | Unit | Value/range | Reference/comment |
|---|---|---|---|---|
| second component mass fraction | f2 | 𝒰(0, 0.3) | only in model featuring a second particle size includes only the mass of pebbles that are consumed | |
| mass in accreted pebbles | mpeb | [m⊕] | ℒ (1, 103) | |
| primordial belt characteristic mass | mbrk | [g] | ℒ (2 × 1019, 2 × 1022) | |
| mass in primordial belt (planetesimals) | mimf | [m⊕] | ℒ(0.3, 105) | |
| pebble aerodynamic size (Stokes number) | τs | ℒ (10−4, 1) | ||
| second pebble aerodynamic size | τ2 | ℒ (10−4, 1) | only in model featuring a second particle size relative velocity between bodies and pebbles see Equation (8) | |
| pebble relative velocity | σ = Δv/vK | ℒ (4 × 10−5, 0.1) | ||
| −headwind parameter | σ = η | |||
| −turbulent Mach number | σ = ℳh | Δv follows a distribution; h is the aspect ratio of the disk and ℳ the turbulence Mach number. | ||
| internal density parameter | χ | 5 × 10−4 | Equation (4). Irrelevant for pebble accretion. fraction of bodies in the primordial belt that ends up in P48. | |
| implantation factor | fimpl | 2 × 10−3 | ||
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