Table 2
Log of observations.
| Date | #Spectraa | Exp. time (s) | Airmassb | Seeing | S∕N order 56c | |
|---|---|---|---|---|---|---|
| Night 1 | 2012-11-11 | 61 (21/40) | 300 | 1.7–1.18–1.5 | Not recorded | 27.9–40.1 |
| Night 2 | 2017-10-24 | 49 (22/27) | 600, 400, 350 | 1.7–1.18–2.0 | 0.8–1.4 | 49.7–68.9 |
| Night 3 | 2017-11-22 | 65 (25d/40) | 300 | 1.4–1.18–2.3 | 0.6–1.0 | 42.1–65.3 |
Notes. (a) In parenthesis: spectra in and out of transit, respectively. (b)Airmass at the beginning, centre, and end of transit. (c)Order 56 contains the sodium feature. (d)From the 25 out-of-transit exposures, 15 exposures after the transit were disregarded due to cloud contamination. The out-of-transit baseline wasbuilt with the 10 remaining exposures before the transit.
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