Table 1
Overview of the observing epochs.
| # | Date | Nexp | ϕ | Weight |
|---|---|---|---|---|
| 1 | 2021-01-11 | 41 | 0.272–0.403 | 0.211 |
| 2 | 2021-01-23 | 37 | 0.563–0.684 | 0.156 |
| 3 | 2021-02-06 | 37 | 0.569–0.694 | 0.165 |
| 4 | 2021-03-21 | 43 | 0.225–0.370 | 0.099 |
| 5 | 2021-04-04 | 33 | 0.190–0.307 | 0.026 |
| 6 | 2021-04-07 | 28 | 0.575–0.667 | 0.059 |
| 7 | 2021-04-08 | 37 | 0.326–0.447 | 0.190 |
| 8 | 2021-04-16 | 34 | 0.603–0.715 | 0.096 |
Notes. Nexp is the number of exposures taken during each run, ϕ is the range of orbital phases of WASP-121 b covered, and weight is the relative weight of each night when used to combine the CCFs in Sect. 4. In particular, the fifth night is weighed down because the observations covered orbital phases near quadrature, where the change in radial velocity is small, leading to partial self-subtraction of the planetary signal.
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