Table 1
Default values for envelope, impactor, and disk parameters.
| Symbol | Description | Value | Comments |
|---|---|---|---|
| γxy | Adiabatic index intermediate region | 1.45 | |
| γz, γg | Adiabatic index high-Z region (pure, mixed) | 1.2, 1.25 | (a) |
| μxy | Mean molecular weight nebular gas | 2.34 u | |
| μz | Mean molecular weight silicate vapor | 60 u | |
| ρi = ρc | Density impactors and core | 3.2 g cm−3 | (b) |
| uevap | Latent heat silicates | 1.5 × 10−11 erg g−1 | (c) |
| Tvap | Outer boundary temperature high-Z region | 2500 K | |
| Ṁz | Pebble accretion rate | 10−5 M⊕ yr−1 | (d) |
| κcst | Opacity prefactor |  |
(e) |
| β, δ | Opacity power-law scaling with density, temperature |  |
(e) |
| Tdisk,5.2, ρdisk,5.2 | Disk temperature and density at 5.2 AU | 150 K, 5 × 10−11 g cm−3 | (f) |
Notes. (a) We choose the mixed index slightly higher to represent the combined effects of compositional mixing, potential dissociation and ionization. (b) Assuming no core compression. (c) From Melosh & Goldin (2008). (d) Typical accretion rate from Lambrechts et al. (2014). (e)Molecular opacity from Bell & Lin (1994). (f)Minimum Mass Solar Nebula; 
and 
(Weidenschilling 1977; Hayashi 1981).
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