Free Access
Table A.1
Expressions for the minimum mass nebula scaling used in this article.
| Quantity | Description | Equation | Value | |
|
|
||||
| m g | Gas molecular mass | 3.9 × 10-24 g | ||
| σ g | Gas collisional cross section (H2) | 2 × 10-15 cm2 | ||
| μ g | Gas dynamic viscosity (H2) |
~
|
||
| M ∗ | Stellar mass | 1.989 × 1033 g | ||
| Σg | Gas surface density |
|
||
| T | Disk temperature |
|
||
| ΩK | Keplerian frequency |
|
|
|
| v K | Keplerian velocity |
|
|
|
| c g | Isothermal sound speed |
|
|
|
| h g | Disk scale height | cg/ ΩK |
|
|
| ρ g | Mid-plane gas density |
|
|
|
| ν g | Gas kinematic viscosity (H2) | μ g / ρ g |
~
|
|
| ν t | Gas turbulent viscosity | α c g h g | α × 4.9 × 1016rAU cm2 s-1 | |
| η | Sub-Keplerian factor | Eq. (19) |
|
|
| λ g | Gas mean free path | m g / σ g ρ g |
|
|
| s lim | Epstein to Stokes limiting size | 9/4 λg |
|
|
| s max | Stokes to quadratic limiting size | 27λgcg/ (2ηrΩK) |
|
|
| τ s | Dimensionless stopping time | Eq. (21) |
|
|
| t s | Stopping time | τs/ ΩK |
|
|
|
Stokes to Epstein orbital distance for τs = 1 |
|
||
| τ f | Dimensionless friction time | Eq. (100) |
|
|
| R B | Bondi radius | Eq. (81) |  [km] |
|
| R H | Hill radius | Eq. (80) |  [km] |
|
|
geometrical-Bondi limit | Eq. (82) |  [km] |
|
|
Bondi-Hill limit | Eq. (83) |  [km] |
|
Notes. rAU ≡ r/ AU; δlim ≡ s/slim; xlim ≡ r/rlim. μg = 8.76 × 10-5 g cm-1 s-1 × 365.85 K/(T + 72 K)(T/ 293.85 K)3/2 (Sutherland’s formula for H2).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.