Table 1
Details of the observations.
| Data set | Night 1 | Night 2 | Night 3 | Night 4 |
|---|---|---|---|---|
| Date (UTC) | 19 March ‘17 | 4 April ‘17 | 11 March ‘18 | 19 March ‘18 |
| Start phase | 0.832 | 0.833 | 0.856 | 0.806 |
| End phase | 0.150 | 0.147 | 0.178 | 0.122 |
| Cadence (s) | 419.3 | 414.3 | 423.2 | 416.6 |
| Exposure time (s) | 213(a) | 213(a) | 213(a) | 213(a) |
| Observation start (UTC) | 02:00:34 | 02:08:22 | 03:54:45 | 03:30:56 |
| Transit start(b) (UTC) | 03:00:31 | 03:08:45 | 04:41:20 | 04:45:12 |
| Mid-transit time(b) (UTC) | 03:24:31 | 03:32:45 | 05:05:20 | 05:09:12 |
| Transit end(b) (UTC) | 03:48:31 | 03:56:45 | 05:29:20 | 05:33:12 |
| Observation end (UTC) | 04:55:18 | 05:01:00 | 06:51:06 | 06:24:31 |
| Nr. spectra pre-transit | 5 | 5 | 4 | 6 |
| Nr. spectra in transit | 4 | 4 | 4 | 4 |
| Nr. spectra post-transit | 4 | 4 | 5 | 3 |
| total Nr of spectra | 13 | 13 | 13 | 13 |
| Na D line region S/n(c) | ||||
| average S/n. per spectrum | 30.79 | 38.44 | 35.65 | 27.92 |
| Total S/n | 61.58 | 76.89 | 71.30 | 55.84 |
| Ca+ triplet region S/n(d) | ||||
| Average S/n per spectrum | 101.17 | 111.27 | 113.65 | 111.34 |
| total S/n | 202.33 | 222.54 | 227.29 | 222.69 |
| Na 5σ limit | 12% | 11% | 14% | 13% |
| Ca+ 5σ limit | 1.8% | 1.7% | 1.7% | 2.0% |
Notes. Theorbital phases of K2-22 b are based on the orbital parameters derived by Sanchis-Ojeda et al. (2015). (a) Except for the last two spectra which have exposure times of 211 s. (b) The transit times are barycentric adjusted to be as measured at the observatory. (c), (d) Derived from the residuals after dividing by the mean spectrum of the featureless regions 5961.0–5965.2 Å and 8584.8–8591.8 Å, respectively.
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