Table 4.
Average astrophysical photodesorption yield in molecule/photon extrapolated from our experimental results, using the method described in Sect. 4.3 (for more details, see Paper I), for different molecules and different ice mixtures at 15 K and without correction for any dilution factor.
| Desorbed molecule | CO:CH3OH ice |
H2O:CH3OH ice |
||
|---|---|---|---|---|
| 6:1 | 1:1 | 3:1 | 1.5:1 | |
| H2O | 5.1 ± 2.6 × 10−5 | 6.2 ± 3.1 × 10−5 | ||
| CO | 1.5 ± 0.8 × 10−2 | 6.4 ± 3.2 × 10−3 | 6.5 ± 3.3 × 10−4 | 5.6 ± 2.7 × 10−4 |
| CO2 | 3.3 ± 1.7 × 10−3 | 2.2 ± 1.1 × 10−3 | 7.3 ± 3.7 × 10−4 | 9.2 ± 4.6 × 10−4 |
| HCO | 6.3 ± 3.2 × 10−4 | 1.9 ± 0.9 × 10−4 | ||
| H2CO | 3.9 ± 2.0 × 10−5 | 1.7 ± 0.9 × 10−5 | 1.4 ± 0.7 × 10−5 | |
| CH2OH, CH3O | 3.9 ± 2.0 × 10−5 | 1.5 ± 0.7 × 10−5 | ||
| CH3OH | [3.4 ± 1.7 × 10−6; | [4.0 ± 2.0 × 10−6; | ||
| 5.7 ± 2.4 × 10−5] ( * ) | 7.5 ± 3.7 × 10−5] ( * ) | |||
| HCOOH, C2H6O | 1.8 ± 0.9 × 10−5 | 7.8 ± 3.9 × 10−6 | ||
Notes. The X-ray emission spectrum used is that of TW Hya from Nomura et al. (2007), to which we applied an attenuation factor corresponding to nH = 1023 cm2. ( * )for CH3OH X-ray photodesorption from CO:CH3OH ice, we provide a range of value extrapolated from our experimental yields of 13CH3OH (minimum value) or 12CH3OH (maximum value) desorption from 13CO:CH3OH ice, the latter estimated yield is less robust, as explained in Sect. 3.2.
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