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 3

WASP-189b SCARLET atmospheric posteriors from the retrieval analysis on the HARPS and NIRPS time series combined.

Parameters	Description	Value
[M/H]	Overall log metallicity	$- {0.11}_{- 0.9}^{+ 0.9}$ $\[-0.11_{-0.9}^{+0.9}\]$
[Ti/H]	Log titanium metallicity	${0.06}_{- 0.11}^{+ 0.10}$ $\[0.06_{-0.11}^{+0.10}\]$
log α_H⁻	Log hydrogen anions abundance multiplier	${0.38}_{- 0.12}^{+ 0.13}$ $\[0.38_{-0.12}^{+0.13}\]$
log α_e⁻	Log free electrons abundance multiplier	$- {1.09}_{- 0.46}^{+ 0.59}$ $\[-1.09_{-0.46}^{+0.59}\]$
T (K)	Atmospheric temperature	$3832_{- 164}^{+ 172}$ $\[3832_{-164}^{+172}\]$
K_p (km/s)	Planet velocity semi-amplitude	${185.0}_{- 7.1}^{+ 7.5}$ $\[185.0_{-7.1}^{+7.5}\]$
V_sys (km/s)	Systemic velocity	$- {27.06}_{- 0.78}^{+ 0.75}$ $\[-27.06_{-0.78}^{+0.75}\]$
FWHM (km/s)	Rotational broadening full width at half maximum	${36.05}_{- 3.06}^{+ 3.53}$ $\[36.05_{-3.06}^{+3.53}\]$

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