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Table 3

Relative depth and detection levels of atmospheric sodium on WASP-121 b for each of the nights and all nights combined.

Line Date Line depth (× 10−3) σ
Night 1 2017-12-31 3.50 ± 0.97 3.61
D1 Night 2(a) 2018-01-09
Night 3 2018-01-14 2 .49 ± 1.05 2.37

Combined(a) 2.66 ± 0.71 3.7

Night 1 2017-12-31 6.62 ± 0.88 7.52
D2 Night 2(a) 2018-01-09
Night 3 2018-01-14 4.66 ± 0.95 4.91

Combined(a) 5.59 ± 0.65 8.60

Notes. The second night was rejected as a spurious signal and is not taken into account. (a) Excluding night two, where we have shown that the apparent detection is likely spurious.

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