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

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Table G.1

Line-contrast upper limits calculated for non-detections of listed neutral chemical species in the NIRPS transmission spectrum of WASP-189b.

Species	3-σ line-contrast upper limit (NIRPS)
Fe	3.1 × 10⁻⁶
Ti	6.1 × 10⁻⁶
V	1.8 × 10⁻⁶
Mn	2.0 × 10⁻⁶
Mg	2.1 × 10⁻⁶
Ca	2.4 × 10⁻⁶
Cr	2.0 × 10⁻⁶
Ni	7.6 × 10⁻⁷
Y	7.2 × 10⁻⁷
Ba	4.7 × 10⁻⁷
Sc	7.8 × 10⁻⁷
Na	1.0 × 10⁻⁶
TiO	4.9 × 10⁻⁶
H₂O	2.6 × 10⁻⁶
CO	3.6 × 10⁻⁶
OH	1.3 × 10⁻⁵

Notes: Upper limits are extracted as described in sub-Section 5.1.3 (i.e. the standard deviation of cross-correlation values from a "noise boxy" continuum region selected away from we expect the planetary signal to pop out in the velocity space).

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