Table 3
Densities and depletion factors.
| Star | Rout | log (ne) | Te | log ( ) |
log (nH) | C/H | Depletion factor | ΣH, 0.03 AU | Missing C |
|---|---|---|---|---|---|---|---|---|---|
| (AU) | (cm−3) | (K) | (cm−3) | (cm−3) | (solar) | – | (g cm−2) | (M⊕) | |
| CW Tau | 0.04 | 13.8 | 4500 | 11.5 (0.1) | 17.0 | 2.4 10−2 |
42 |
4142 | 2.9 × 10−3 |
| DR Tau | 0.05 | 13.4 | 4250 | 11.7 (0.2) | 16.7 | 7.4 10−2 |
13 |
2792 | 2.5 × 10−3 |
| FZ Tau | 0.1 | 12.8 | 4000 | 11.3 (0.3) | 16.1 | 1.2 10−1 |
8 |
678 | 3.6 × 10−3 |
| DO Tau | 0.1 | 12.6 | 5000 | 10.7 (0.3) | 15.9 | 4.6 10−2 |
22 |
476 | 2.1 × 10−3 |
| DL Tau | 0.05 | 12.4 | 5000 | 11.1 (0.2) | 15.7 | 1.9 10−1 |
5 |
252 | 1.9 × 10−4 |
Notes. Results of the CHIANTI slab model fits to the (1) C0 line ratios for ne and Te and (2) absolute line fluxes for nc. The values of nH are calculated from the ne(nH) dependence from the Cloudy slab models. All disks show a depletion in the C/H abundance relative to the solar value, which is taken to be 2.69 × 10−4. The surface density of hydrogen gas was calculated assuming a density profile in hydrostatic equilibrium with a midplane temperature equal to Te. The mass of“missing” carbon inferred for a static disk from the depletion factor is given in the last column. References for outer radii are given in Appendix B.
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