Table 1
APE input parameters.
Name | Unit | Description | Main impact on the model | Recommended range |
---|---|---|---|---|
Grid parameters | ||||
loggrid | Boolean | Logarithmic grid or linear | Spatial resolution | .true. – .false. |
rad_min_au | au | Innermost cell radius | Spatial resolution | 0.1–100 |
rad_max_au | au | Outermost cell radius | Simulated region size | 50–10 000 |
nrad | Integer | Number of radial cells | Spatial resolution | 10–1000 |
theta_min_deg | degrees | Minimum polar angle | Simulated region size | 0–89 |
theta_max_deg | degrees | Maximum polar angle | Simulated region size | 1–90 |
ntheta | Integer | Number of polar cells | Polar resolution | 10–100 |
radmc_output | Boolean | Produce RADMC-3D-ready inputs | None | .true. – .false. |
snapshot_nautilus | Boolean | Produce Nautilus-ready inputs on a snapshot | None | .true. – .false. |
nautilus_time_kyr | kyr | Duration of the nautilus simulation | None | 0–20 |
Model parameters | ||||
Mass | M⊙ | Mass of the Bonnor–Ebert sphere | Envelope density, tff | 0.2–8 |
time_years | years | Time after the start of the collapse | Envelope, star and disk | 0–2tff (~ 3 × 105) |
t_pstar_age | Boolean | Is time_years the age of the central object a | Same as time_years | .true. – .false. |
temp_mol_cloud | K | Temperature of the surround molecular cloud | Temperature in the system | 5–30 |
masstoflux | None | Mass to flux ratio (∝1/B) | Disk size | 1−∞ |
coagulation | Boolean | Enable estimation of dust growth | Radiative transfer | .true. – .false. |
dust_to_gas | None | Desired dust-to-gas mass ratio | Radiative transfer | 0.001–0.1 |
alphadisk | None | α-disk parameter | Disk scale height | 0.0001–0.1 |
disk_cutoff | Boolean | If true., uses a sharp cut-off of the disk | Disk profile | .true. – .false. |
use_radmc_temp | Boolean | If true. use RADMC-3D temperature | Gas temperature | .true. – .false. |
Particle parameters | ||||
x_ini, z_ini | au | Initial x (cylindrical radius) and Z coordinates | Particle trajectory | 0–20 000 |
tmax | years | Maximum time for the particle evolution | None | 0−∞ |
dt0 | years | Maximum allowed time-step | Trajectory accuracy | 1–1000 |
dyn_fact | None | Time-step limitation near box edges | Trajectory accuracy | 100–1000 |
Omega0 | rad s−1 | Angular velocity of the cloud | Envelope rotation | 10−15−10−12 |
cloud_extinction | mag | Visual extinction of the surrounding cloud | Chemical post-processing | 0−∞ |
Reverse | Boolean | Compute particle trajectories backward in time | None | .true–.false. |
Notes. a By default, the parameter time_years represents the time after the start of the collapse of the initial Bonnor-Ebert sphere. However, the user may find more convenient to choose directly a time after the formation of the central object. This can be done by adding tff to the desired age for the central object, but setting the parameter t_pstar_age to .true. does this automatically. In that case, the parameter time_years then represents the time after the formation of the central object.
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