Hydride ion continuum hides absorption signatures in the NIRPS near-infrared transmission spectrum of the ultra-hot gas giant WASP-189b

Open Access

Table 2

Log of NIRPS and HARPS transit observations.

Date	Night 1 2023-04-24	Night 2 2023-06-04
NIRPS
Number of spectra	78	112
Exp. time (s)	200	200
Avg. seeing (″)	1.61	0.6
Avg. S/N order 57 ^(⋆)	162	160
S/N Y band	147	148
HARPS
Number of spectra	98	101
Exp. time (s)	200	200
Avg. seeing (″)	1.61	0.6
S/N at 550 nm	93	111

Notes. ^(⋆)In NIRPS spectra, we choose as reference the spectral order 57 centred at 16 285 Å (H band) because it is little affected by telluric absorption lines.

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