Knobs and dials of retrieving JWST transmission spectra - II. Impacts of pipeline-level differences on retrieval posteriors

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Table B.1

Model evaluation metrics for the model tuning process based on the SP-TW dataset.

ID	Model description	ln E	ln B_m0	Ψ	∆ m	#FP	${\bar{χ}}_{ν}^{2}$ $\bar{\chi}^2_\nu$
Initial opacity search
0	Baseline (CO, CO₂, CH₄, H₂O)	642.02	—	−1306.02	55.00	10	3.26
1	Removed CO	634.52	−7.50	−1304.88	56.14	9	3.26
2	Removed H₂O	515.48	−126.54	−1063.76	297.26	9	6.00
3	Removed CH₄	642.73	0.71	−1309.45	51.57	9	3.21
4	Removed CO₂	193.96	−448.06	−423.07	937.95	9	13.28
5	Added SO₂	647.65	5.63	−1323.51	37.51	11	3.06
6	Added H₂S	661.40	19.38	−1350.08	10.95	11	2.75
7	Added HCN	647.20	5.18	−1322.10	38.92	11	3.08
8	Added C₂H₂	648.95	6.92	−1321.43	39.60	11	3.09
9	Added C₂H₄	640.31	−1.72	−1303.85	57.17	11	3.29
10	Added CH₃	641.84	−0.18	−1303.80	57.22	11	3.29
11	Added NH₃	641.02	−1.00	−1303.70	57.32	11	3.29
Combinations of {C₂H₂, H₂S, HCN, SO₂}
12	Added {H₂S,HCN}	663.67	21.65	−1348.69	12.33	12	2.77
13	Added {H₂S,SO₂}	662.52	20.49	−1353.36	7.66	12	2.72
14	Added {HCN,SO₂}	651.16	9.14	−1329.87	31.15	12	2.99
15	Added {C₂H₂, SO₂}	656.27	14.24	−1345.07	15.95	12	2.81
16	Added {C₂H₂, HCN}	649.54	7.52	−1327.72	33.30	12	3.02
17	Added {C₂H₂,H₂S}	663.65	21.63	−1354.81	6.21	12	2.70
18	Added {H₂S,SO₂,HCN}	664.08	22.06	−1351.26	9.76	13	2.74
19	Added {C₂H₂,HCN,SO₂}	657.63	15.60	−1344.19	16.83	13	2.83
20	Added {C₂H₂,H₂S,SO₂}	666.06	24.03	−1361.02	—	13	2.63
21	Added {C₂H₂,H₂S,HCN}	664.01	21.99	−1352.96	8.06	13	2.72
22	Added {C₂H₂, H₂S, HCN, SO₂}	665.88	23.85	−1358.32	2.70	14	2.66

Notes. The columns show the ID and corresponding molecular inventory of the forward models used for model tuning. The Bayesian evidence (ln E) is used to calculate the Bayes factor (ln B_m0) in reference to the baseline model (M₀). The cAIC (Ψ) is used to calculate the relative metric ∆_m = Ψ_min - Ψ_m (where Ψ_min corresponds to M₂₀). The last two columns indicate the number of free parameters in the model, as well as the reduced χ-square metric ( ${\bar{χ}}_{ν}^{2}$ $\bar{\chi}^2_\nu$ ) of the median model.

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