Table 4
Impactor size and time to reproduce CO available observations and upper limit, respectively (Cavalié et al. 2014; Teanby & Irwin 2013).
| Case | D | timpact | CO mass | qCO | |
|---|---|---|---|---|---|
| (km) | yr ago | (g) | 0.5–0.3 mbar | 200–100 mbar | |
| 0a | 0.64 | 250 | 3.5 × 1013 | (7.0 ± 0.1) × 10−9 | (5.2–5.3) × 10−10 |
| 1 | 1.5 | 524 | 4.6 × 1014 | (7.0 ± 0.1) × 10−9 | (6.5–6.8) × 10−10 |
| 2 | 1.6 | 549 | 5.7 × 1014 | (7.0 ± 0.1) × 10−9 | (6.7–7.0) × 10−10 |
| 3 | 2.0 | 629 | 1.1 × 1015 | (7.0 ± 0.1) × 10−9 | (7.4–7.8) × 10−10 |
| 4 | 3.5 | 822 | 5.6 × 1015 | (7.0 ± 0.1) × 10−9 | (9.8–10.0) × 10−10 |
| 5 | 4.0 | 872 | 8.6 × 1015 | (7.0 ± 0.1) × 10−9 | (10.1–11.4) × 10−10 |
| 6 | 4.9 | 950 | 1.6 × 1016 | (7.0 ± 0.1) × 10−9 | (12.1–13.0) × 10−10 |
Notes. (a) Model run for a size of the impactor as in Cavalié et al. (2014), the eddy diffusion coefficient being K(z) =5000 cm2 s−1, our nominal value for K(z), unlike in Cavalié et al. (2014) who consider 1200 cm2 s−1. The evolution time needed to obtain a CO mixing ratio that matches the Herschel observations is shorter than the 370 yr needed in Cavalié et al. (2014) mainly due to a higher eddy diffusion coefficient.
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