The bulk metal content of WASP-80 b from joint interior-atmosphere retrievals - Breaking degeneracies and exploring biases with panchromatic spectra

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Volume 706 (February 2026)

A&A, 706 (2026) A263

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Table 2

Priors used in the interior and equilibrium chemistry atmosphere retrievals.

Interior retrievals
Parameter	Prior
Core mass fraction, CMF^a	𝒰(0, 0.99)
Atmospheric metallicity, log(M/H) (× solar)	𝒰(−2.0,2.4)
Planet mass, M_pl (M_Jup)	𝒩(0.55,0.04)
Age [Gyr]	𝒩(1.35,0.2)

Atmosphere retrievals
Parameter	Prior

log(κ_IR) (cm²/g)^a	𝒰(−6, 6)
γ^a	𝒰(0.1, 2.0)
T_i (K)^a	𝒰(0, 2000)
T_e (K)^a	𝒰(0, 2000)
Planet mass, M_pl (M_Jup)^a	𝒩(0.55, 0.04)
Planet radius, R_pl (R_Jup)	𝒩(0.95, 0.03)
Reference pressure, log(P_ref) (bar)	𝒰(−6, 3)
Atmospheric metallicity, log(M/H) (× solar)^a	𝒰(−1, 3)
C/O^a	𝒰(0.1, 1.6)
log(κ₀) (cm²/g)^a,b	𝒰(−20, 20)
log(P_base) (bar)^a,b	𝒰(−5, 3)
f_sed^a,b	𝒰(0, 10)
log(λ₀) (μm)^a,b	𝒰(−2, 2)
p^a,b	𝒰(0, 6)
Offset_dataset (ppm)^a	𝒩(0, 100)
Stellar radius, R_* (R_⊙)^a	0.571 (fixed)
Stellar effective temperature, T_* (K)^a	4145 (fixed)

Notes. 𝒩(μ, σ): Gaussian prior. 𝒰(low, high): uniform prior. ^a The joint interior-atmosphere retrievals use similar priors for this parameter. ^b Cloud parameters apply only when transmission spectra data are considered in the retrieval.

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