Quantifying thermal water dissociation in the dayside photosphere of WASP-121 b using NIRPS

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Volume 701 (September 2025)

A&A, 701 (2025) A276

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Table B.1

Results of the retrieval for the retrievals where five PCs were removed (same as the main retrieval presented in this article) and where ten PCs were removed.

Parameter [unit]	5 PCs	10 PCs
log₁₀H₂O	$- {3.49}_{- 0.93}^{+ 0.99}$ $\[-3.49_{-0.93}^{+0.99}\]$	$- {3.49}_{- 1.34}^{+ 0.99}$ $\[-3.49_{-1.34}^{+0.99}\]$
log₁₀OH	$- {3.59}_{- 1.08}^{+ 1.01}$ $\[-3.59_{-1.08}^{+1.01}\]$	$- {3.62}_{- 1.35}^{+ 1.00}$ $\[-3.62_{-1.35}^{+1.00}\]$
log₁₀Fe	$- {2.91}_{- 1.36}^{+ 1.10}$ $\[-2.91_{-1.36}^{+1.10}\]$	$- {3.19}_{- 1.57}^{+ 1.13}$ $\[-3.19_{-1.57}^{+1.13}\]$
log₁₀Mg	$- {2.75}_{- 1.37}^{+ 1.09}$ $\[-2.75_{-1.37}^{+1.09}\]$	$- {3.01}_{- 1.41}^{+ 1.18}$ $\[-3.01_{-1.41}^{+1.18}\]$
log₁₀H⁻	< −6.06 (3 σ limit)	< −6.28 (3 σ limit)
log₁₀e⁻	< −1.03 (3 σ limit)	< −1.04 (3 σ limit)
K_p [km s⁻¹]	${217.21}_{- 0.62}^{+ 0.63}$ $\[217.21_{-0.62}^{+0.63}\]$	${217.01}_{- 0.66}^{+ 0.58}$ $\[217.01_{-0.66}^{+0.58}\]$
V_sys [km s⁻¹]	38.04 ± 0.52	${38.12}_{- 0.56}^{+ 0.44}$ $\[38.12_{-0.56}^{+0.44}\]$
ΔV_sys,H₂O [km s⁻¹]	${4.79}_{- 0.97}^{+ 0.93}$ $\[4.79_{-0.97}^{+0.93}\]$	4.24 ± 0.91

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