Table 4
Formation and destruction rates for the different species at different locations in the midplane of the disk for each model.
| Species | Location (x, z) (au) | Main formation reaction rate (cm−3 s−1) | Main destruction reaction rate (cm−3 s−1) | ||||
|---|---|---|---|---|---|---|---|
| Z1 | Z01 | Z001 | Z1 | Z01 | Z001 | ||
| H2O# | (2.70, 0) | 4.35 × 10−14 (freeze out) | 5.19 × 10−14 (surface reaction) | 4.9 × 10−3 (surface reaction) | 4.37 × 10−15 (thermal desorption) | 4.79 × 10−14 (thermal desorption) | 4.92 × 10−3 (photodiss., Eq. (A.1)) |
| CH4 | (1.54,0) | 3.44 × 10−13 (diss. recombination, Eq. (A.2)) | 3.84 × 10−11 (diss. recombination, Eq. (A.2)) | 1.21 × 10−7 (ion-neutral, Eq. (A.3)) | 2.43 × 10−13 (ion-neutral) | 2.44 × 10−11 (ion-neutral) | 9.98 × 10−8 (photodiss.) |
| CO | (6.4,0) | 7.41 × 10−25 (diss. recombination, Eq. (A.6)) | 3.74 × 10−14 (neutral-neutral, Eq. (A.7)) | 1.31 × 10−5 (photodiss, Eq. (A.8)) | 9.47 × 10−24 (ion-neutral) | 8.31 × 10−13 (ion-neutral) | 1.37 × 10−5 (neutral-neutral) |
| CO# | (27.6, 0) | 4.36 × 10−21 (surface reaction, Eq. (A.9)) | 9.56 × 10−9 (freeze out) | 3.76 × 10−7 (freeze out) | 4.40 × 10−21 (surface reaction) | 1.82 × 10−8 (photodiss.) | 3.90 × 10−7 (photodiss.) |
| CO2 | (9.55,0) | 3.27 × 10−30 (thermal desorption) | 2.74 × 10−14 (photon desorption) | 1.32 × 10−6 (neutral-neutral, Eq. (A.10)) | 2.72 × 10−30 (ion-neutral) | 2.77 × 10−14 (ion-neutral) | 1.36 × 10−6 (photodiss.) |
| CO2# | (9.55,0) | 6.79 × 10−31 (freeze out) | 7.20 × 10−16 (freeze out) | 2.86 × 10−8 (freeze out) | 2.51 × 10−29 (photodiss.) | 2.74 × 10−14 (photodesorption) | 3.10 × 10−8 (photodesorption) |
| HCN | (1.81,0) | 1.89 × 10−12 (diss. recombination, Eq. (A.13)) | 3.47 × 10−11 (diss. recombination, Eq. (A.13)) | 2.49 × 10−4 (neutral-neutral, Eq. (A.14)) | 2.64 × 10−12 (ion-neutral) | 4.93 × 10−11 (ion-neutral) | 1.89 × 10−4 (photodiss.) |
| HCN# | (10.20,0) | 1.94 × 10−22 (surface reaction) | 6.77 × 10−12 (surface reaction) | 9.34 × 10−8 (surface reaction) | 2.41 × 10−22 (thermal desorption) | 6.76 × 10−12 (photodiss., Eq. (A.15)) | 9.41 × 10−8 (photodiss., Eq. (A.15)) |
| CN | (2.53,0) | 3.46 × 10−20 (diss.recombination, Eq. (A.11)) | 1.45 × 10−12 (diss. recombination, Eq. (A.11)) | 1.16 × 10−3 (photodiss., Eq. (A.12)) | 2.61 × 10−20 (neutral-neutral) | 1.10 × 10−12 (neutral-neutral) | 8.28 × 10−4 (neutral-neutraL) |
| CN# | (95.36, 0) | 9.77 × 10−14 (photodiss., Eq. (A.15)) | 1.13 × 10−17 (photodiss., Eq. (A.15)) | 7.80 × 10−21 (photodiss., Eq. (A.15)) | 9.31 × 10−14 (surface reaction) | 7.48 × 10−18 (surface reaction) | 4.64 × 10−21 (surface reaction) |
| HCO+ | (50.23, 0) | 5.10 × 10−19 (ion-neutral, Eq. (A.16)) | 1.70 × 10−8 (ion-neutral, Eq. (A.17)) | 5.32 × 10−8 (ion-neutral, Eq. (A.17)) | 1.47 × 10−18 (diss. recombination) | 9.21 × 10−9 (diss. recombination) | 4.66 × 10−8 (diss. recombination) |
| N2H+ | (10.36, 0) | 5.21 × 10−47 (ion-neutral, Eq. (A.18)) | 1.68 × 10−23 (ion-neutral, Eq. (A.18)) | 7.52 × 10−7 (ion-neutral, Eq. (A.18)) | 4.85 × 10−47 (diss. recombination) | 1.56 × 10−23 (diss. recombination) | 6.93 × 10−7 (ion-neutral) |
Notes. The ice species are followed by a #. The red and green shaded cells represent the reactions responsible for a relative overabundance (red) or underabundance (green). The reaction rate is the reaction coefficient multiplied by the number densities of the reactants. The reaction type is given in the brackets under the reaction rate with the corresponding reaction equation number. The equations are given in Appendix A. The location was determined by choosing the point in the midplane where the differences between the column density of models Z01 and Z001 and the respective scaled-down column densities are the highest.
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