Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458 b

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Table 4

Summary of all retrievals run on the HST spectra.

Spectrum	Retrieval model	Line species	Water abundance log (χ_H₂O) in VMR	$χ_{red}^{2}$ $\[\chi_{\text {red }}^{2}\]$	Bayesian evidence log (Z)	Z_ref/Z
model_ramp	Clouds	All	$- {4.33}_{- 1.16}^{+ 1.86}$ $\[-4.33_{-1.16}^{+1.86}\]$	1.66	101.1 ± 0.2	3.16
model_ramp	Patchy clouds	All	$- {4.97}_{- 0.55}^{+ 2.06}$ $\[-4.97_{-0.55}^{+2.06}\]$	1.95	100.0 ± 0.1	3.98
model_ramp	No clouds	All	$- {5.50}_{- 0.27}^{+ 0.26}$ $\[-5.50_{-0.27}^{+0.26}\]$	1.49	99.9 ± 0.1	5.01
model_ramp	No clouds	Only H₂O	$- {5.50}_{- 0.27}^{+ 0.42}$ $\[-5.50_{-0.27}^{+0.42}\]$	1.33	100.6 ± 0.0	ref
model_ramp	Clouds	Only H₂O	$- {5.12}_{- 0.53}^{+ 2.95}$ $\[-5.12_{-0.53}^{+2.95}\]$	1.37	100.5 ± 0.0	1.26
model_ramp	No clouds	No H₂O	. . .	2.21	96.5 ± 0.1	12589.3
model_ramp	Clouds	No H₂O	. . .	1.98	96.8 ± 0.1	6309.6
model_ramp	No clouds	No CH₄	$- {5.41}_{- 0.27}^{+ 0.36}$ $\[-5.41_{-0.27}^{+0.36}\]$	1.48	100.2 ± 0.1	2.51
model_ramp	No clouds	No NH₃	$- {5.51}_{- 0.27}^{+ 0.27}$ $\[-5.51_{-0.27}^{+0.27}\]$	1.67	100.0 ± 0.1	3.98
model_ramp	No clouds	No HCN	$- {5.51}_{- 0.28}^{+ 0.26}$ $\[-5.51_{-0.28}^{+0.26}\]$	1.51	99.9 ± 0.0	5.01
model_ramp	No clouds	No Na	$- {5.49}_{- 0.27}^{+ 0.28}$ $\[-5.49_{-0.27}^{+0.28}\]$	1.57	99.9 ± 0.1	5.01

Deming et al. (2013)	Clouds	All	$- {5.05}_{- 0.37}^{+ 1.62}$ $\[-5.05_{-0.37}^{+1.62}\]$	2.46	101.6 ± 0.0	3.16
Deming et al. (2013)	Patchy clouds	All	$- {5.12}_{- 0.30}^{+ 0.51}$ $\[-5.12_{-0.30}^{+0.51}\]$	2.51	102.0 ± 0.2	1.26
Deming et al. (2013)	No clouds	All	$- {5.24}_{- 0.28}^{+ 0.26}$ $\[-5.24_{-0.28}^{+0.26}\]$	2.22	101.9 ± 0.1	1.58
Deming et al. (2013)	No clouds	Only H₂O	$- {5.58}_{- 0.13}^{+ 0.15}$ $\[-5.58_{-0.13}^{+0.15}\]$	1.99	102.1 ± 0.1	ref
Deming et al. (2013)	No clouds	No H₂O	. . .	4.36	91.0 ± 0.0	1.26 · 10¹¹
Deming et al. (2013)	Clouds	Only H₂O	$- {5.57}_{- 0.13}^{+ 0.16}$ $\[-5.57_{-0.13}^{+0.16}\]$	2.08	101.6 ± 0.1	3.16

Notes. The model with the highest Bayesian evidence is the one labelled no clouds, only H₂O. For a description of the cloud models, see Table 3. Results for all parameters are summarised in Table A.1.

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