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Table 5
Parameters of the standard DM Tau disk model.
| Parameter | Symbol | Value |
|---|---|---|
| Star | ||
| Distance | d* | 140 pc |
| Temperature | Teff | 3720 K |
| Radius | R* | 1.2 R⊙ |
| Mass | M* | 0.65 M⊙ |
| UV flux at 100 au | χ* | 410χ0 |
| X-ray luminositya | LX | 1031 erg s−1 |
| Disk | ||
| Accretion rate | Ṁ | 5 × 10−9 M⊙ yr−1 |
| Viscosity | α | 10−2 |
| Mass | Md | 6.65 × 10−2 M⊙ |
| Surface density at 1 au | Σ0 | 4.182 × 1024 cm−2 |
| Inner radius |  |
0.03 au |
| Outer radius |  |
800 au |
| Gas-to-dust mass ratio | mgd | 100 |
| X-ray ionization exponent | n | 2.81 |
| X-ray cross section at 1 keV | σ−22 | 0.85 × 10−22 cm2 |
| CRP ionization rate | ζCRP | 1.3 × 10−17 s−1 |
| SLR ionization rate | ζSLR | 6.5 × 10−19 s−1 |
| Chemistry | ||
| Average grain radius | ad | 0.1 μm |
| Average grain density | ρd | 3 g cm−3 |
| Sticking coefficientb | S | 1 |
| Amount of surface sites | Ns | 1.88 × 106 |
| UV photodesorption yield | YUV | 10−5 |
| Chemical desorption yield | YCD | 10−2 |
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