Solar System Formation Solver · Disk Physics Forward Model

Disk Structure

Σ₀ (g/cm²)1700[200-5k]

p (slope)1.50[0.5-2.5]

T₀ (K @1AU)280[200-400]

r_disk (AU)40[20-80]

Magnetic Field

log₁₀(β)4.0[2-6]

DZ outer (AU)15.0[5-25]

DZ inner (AU)0.50[0.1-2]

α turb10⁻³[10⁻⁴-10⁻²]

Condensation

T_snow (K)170[130-200]

f_ice (×Σ)3.50[2-6]

T_CO₂ (K)70[50-90]

T_CO (K)20[15-30]

Rocky Structure

a_inner (AU)0.39[0.2-0.6]

r_conv (AU)1.00[0.8-1.3]

r_trunc (AU)1.52[1.0-2.0]

Ice Giant Structure

f_UranusAnchor0.90[0.7-1.1]

s_ice (ratio)1.570[1.3-1.8]

Gas Giant Structure

f_JupAnchor1.200[0.9-1.4]

s_gas (ratio)1.830[1.5-2.1]

Migration

f_mig0.50[0-1]

t_disk (Myr)5.0[1-10]

Mass Formation

dust_to_gas0.010[.005-.03]

accr_rocky0.15[.01-.5]

accr_giant0.50[.1-.95]

gas_thresh (M⊕)8.0[1-15]

Refinement

opacity_f1.00[0.5-3.0]

L_star_f1.00[0.8-1.2]

res_lock_p0.50[0.1-1.0]

Post-Disk Phase (Giant Impacts)

rocky_growth2.5[1.0-5.0]

merc_strip0.30[.05-.8]

Ready · Differential Evolution (pop=150, gen=2000) · 30 parameters · 3 phases

Fitness

—

χ² = Σ[log(r_pred/r_obs)]²

Predicted vs Observed

Planet	Actual	Pred.	Err%

Formation Zones

Physics Summary

SPICE-RACS Connection

Galactic B at solar radius: ~6 μG
Disk |RM| at solar l: ~121 rad/m²
Best-fit galactic n: ≈ 1.0
The ambient galactic field set the initial conditions of the molecular cloud that collapsed to form the solar system — determining angular momentum budget and disk mass via magnetic braking.

PROTOPLANETARY DISK FORMATION SOLVER