Evidence for SiO cloud nucleation in the rogue planet PSO J318

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Volume 703 (November 2025)

A&A, 703 (2025) A79

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Table 5

Properties of the parameter grids explored for the selfconsistent grid retrievals of the PSO J318 data.

Parameter	Grid extent	Step	16–84-%-Range
Exo-REM
T_eff (K)	800–2000	50	${1249.9991}_{- 0.0014}^{+ 0.0007}$ $\[1249.9991_{-0.0014}^{+0.0007}\]$ ^(a)
log₁₀(g)	3.0–5.0	0.5	${3.0000004}_{- 0.00000003}^{+ 0.00000007}$ $\[3.0000004_{-0.00000003}^{+0.00000007}\]$ ^(b)
[M/H]	−0.5–1.0	0.5	${0.1724}_{- 0.0001}^{+ 0.0001}$ $\[0.1724_{-0.0001}^{+0.0001}\]$
C/O	0.1–0.8	0.05	${0.6}_{- 0.00000001}^{+ 0.00000001}$ $\[0.6_{-0.00000001}^{+0.00000001}\]$ ^(a)
R (R_Jup)	0.5–20	−	${1.26}_{- 0.02}^{+ 0.02}$ $\[1.26_{-0.02}^{+0.02}\]$

ATMO
T_eff (K)	800–2000	100	${1208.93}_{- 0.05}^{+ 0.05}$ $\[1208.93_{-0.05}^{+0.05}\]$
log₁₀(g)	2.5–5.5	0.5	${2.5000006}_{- 0.0000004}^{+ 0.0000009}$ $\[2.5000006_{-0.0000004}^{+0.0000009}\]$ ^(b)
[M/H]	−0.6–0.6	0.3	${0.0316}_{- 0.0004}^{+ 0.0004}$ $\[0.0316_{-0.0004}^{+0.0004}\]$
C/O	[0.3, 0.55, 0.7]	−	${0.3000007}_{- 0.0000006}^{+ 0.000001}$ $\[0.3000007_{-0.0000006}^{+0.000001}\]$ ^(b)
γ	[1.01, 1.03, 1.05]	−	${1.01145}_{- 0.00003}^{+ 0.00003}$ $\[1.01145_{-0.00003}^{+0.00003}\]$
R (R_Jup)	0.5–20	−	${1.28}_{- 0.02}^{+ 0.02}$ $\[1.28_{-0.02}^{+0.02}\]$

Diamondback
T_eff (K)	900–2000	100	${1109.08}_{- 0.04}^{+ 0.04}$ $\[1109.08_{-0.04}^{+0.04}\]$
log₁₀(g)	3.5–5.5	0.5	${3.5001}_{- 0.0001}^{+ 0.0002}$ $\[3.5001_{-0.0001}^{+0.0002}\]$ ^(b)
[M/H]	−0.5-0.5	0.5	${0.4999998}_{- 0.0000002}^{+ 0.0000002}$ $\[0.4999998_{-0.0000002}^{+0.0000002}\]$ ^(b)
f_sed	[1, 2, 3, 4, 8]	−	${1.0000003}_{- 0.0000002}^{+ 0.0000005}$ $\[1.0000003_{-0.0000002}^{+0.0000005}\]$ ^(b)
R (R_Jup)	0.5–20	−	${1.47}_{- 0.03}^{+ 0.03}$ $\[1.47_{-0.03}^{+0.03}\]$

Notes. The last column lists the range of the 16–84 percentile regions from the retrieval posterior, as returned by species. (a) Median value at grid point coordinates. (b) Posterior converged to prior boundary (i.e., grid boundary).

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