Panchromatic view of the frigid Jovian exoplanet COCONUTS-2 b

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Volume 710 (June 2026)

A&A, 710 (2026) A46

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Table A.3

Inversion results of Sect. 3.

Parameter Units	ln B	T_eff (K)	log(g) (dex)	[M/H] (dex)	C/O	f_sed	log(K_zz) log(cm².s⁻¹)	R (R_Jup)	log(L/L_⊙) (dex)
BT-Settl priors BT-Settl posteriors		U (200,1000)	U(3.5,4.5)					U (0,2)
classic	7643	$447_{- 2}^{+ 3}$ $Mathematical equation: $447^{+3}_{-2}$$	> 4.49	(0.00)	(0.55)	(microphys.)	(profile)	1.03 ± 0.01	$- {6.180}_{- 0.002}^{+ 0.001}$ $Mathematical equation: $-6.180^{+0.001}_{-0.002}$$
GP	1219	463 ± 3	${4.48}_{- 0.02}^{+ 0.01}$ $Mathematical equation: $4.48^{+0.01}_{-0.02}$$	(0.00)	(0.55)	(microphys.)	(profile)	0.96 ± 0.01	-6.190 ± 0.003

Sonora Diamondback priors Sonora Diamondback posteriors		U (400,600)	U (3.5, 5.5)	U (-0.5,0.5)		U (1,8)		U (0,2)
classic	6645	> 600	${5.000}_{- 0.002}^{+ 0.003}$ $Mathematical equation: $5.000^{+0.003}_{-0.002}$$	0.194 ± 0.004	(0.458)	${3.6}_{- 0.2}^{+ 0.1}$ $Mathematical equation: $3.6^{+0.1}_{-0.2}$$	(profile)	0.59 ± 0.01	-6.214 ± 0.006
GP	732	515 ± 1	${4.500}_{- 0.004}^{+ 0.003}$ $Mathematical equation: $4.500^{+0.003}_{-0.004}$$	-0.43 ± 0.01	(0.458)	> 7.1	(profile)	${1.65}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $1.65^{+0.02}_{-0.03}$$	-5.71 ± 0.01

Sonora Elf Owl priors Sonora Elf Owl posteriors		U (400, 600)	U (3.25, 5.5)	U (-1.0,1.0)	U (0.229,1.145)		U (2, 9)	U (0,2)
classic	4593	$517_{- 2}^{+ 1}$ $Mathematical equation: $517^{+1}_{-2}$$	< 3.25	-0.33 ± 0.01	0.317 ± 0.005		${3.99}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $3.99^{+0.02}_{-0.03}$$	0.84 ± 0.01	-6.199 ± 0.002
GP	0	$549_{- 3}^{+ 2}$ $Mathematical equation: $549^{+2}_{-3}$$	< 3.25	-0.30 ± 0.02	0.42 ± 0.01		3.50 ± 0.07	0.81 ± 0.01	-6.190 ± 0.005

ATMO2020++ (no PH₃) priors ATMO2020++ (no PH₃) posteriors		U (250,1200)	U (2.5, 5.5)	U (-1.0,0.3)				U (0,2)
classic	4401	538 ± 2	4.94 ± 0.02	0.25 ± 0.01	(0.55)		(5.12 ± 0.04)	0.77 ± 0.01	-6.202 ± 0.002
GP	319	493 ± 3	4.14 ± 0.02	-0.09 ± 0.02	(0.55)		(6.72 ± 0.04)	1.01 ± 0.01	-6.186 ± 0.002

ATMO2020++ priors ATMO2020++ posteriors		U (250,1200)	U(2.5, 5.5)	U (-1.0,0.3)				U (0,2)
classic	4262	514 ± 1	4.80 ± 0.01	> 0.30	(0.55)		(5.40 ± 0.02)	0.93 ± 0.01	-6.179 ± 0.002
GP	94	$496_{- 3}^{+ 5}$ $Mathematical equation: $496^{+5}_{-3}$$	${4.30}_{- 0.02}^{+ 0.04}$ $Mathematical equation: $4.30^{+0.04}_{-0.02}$$	$- {0.02}_{- 0.02}^{+ 0.03}$ $Mathematical equation: $-0.02^{+0.03}_{-0.02}$$	(0.55)		( ${6.40}_{- 0.08}^{+ 0.04}$ $Mathematical equation: $6.40^{+0.04}_{-0.08}$$ )	${1.03}_{- 0.02}^{+ 0.01}$ $Mathematical equation: $1.03^{+0.01}_{-0.02}$$	-6.163 ± 0.002

Notes. First column: log-Bayes factors relative to the Sonora Elf Owl (GP). Remaining columns: Grid priors and posteriors. U(a, b) refers to a uniform distribution between a and b. The error bars correspond to the lower and upper bounds in the parameter space encompassing 68% of the retrieved solutions around the best fit. Luminosities were computed using Eq. (3) from Zhang et al. (2025) to account for model-data discrepancies. Values inside parentheses are fixed by the model grids. In particular, the log(K_zz) values of the ATMO2020++ and ATMO2020++ (no PH₃) modeling results are linearly interpolated from the inferred log(g) using Fig. 1 of Phillips et al. (2020).

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