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Table 4

Priors for the HD 984 B retrieval.

Parameter Prior Parameter Prior
RV (km s−1) 𝒰(−40, −10) Tint (K) 𝒰(500, 4000)
v sin i (km s−1) 𝒰(5, 25) T3 (K) 𝒰(0, Tconnect (b))
Rcomp (RJup) 𝒰(0.5, 2.3) T2 (K) 𝒰(0, T3)
αp (%) 𝒰(30, 110) T1 (K) 𝒰(0, T2)
αs (%) 𝒰(−10, 70) log(Pquench) 𝒰(−4, 3)
σs 𝒰(1.0, 1.2) α 𝒰(1, 2)
log g 𝒰(3.5, 6) C/O 𝒰(0.1, 1.6)
log(12CO/13CO) 𝒰(0, 6) [Fe/H] 𝒰(−1.5, 1.5)
log(δ) Pphot ∈ [10−3, 102](a)

Additional parameter for gray model

log(gray opacity) (cm2 g−1) 𝒰(−6, 1)

Additional parameters for cloudy model

log(Kzz/cm2 s−1) 𝒰(5, 13) fsed 𝒰(0, 10)
σg 𝒰(1.05, 3) log(X˜C)(c)$\log {\left( {{{\widetilde {\rm{X}}}_{\rm{C}}}} \right)^{(c)}}$ 𝒰(−2.3, 1)

Notes. For all parameters, we adopted uniform or log-uniform priors (shown as 𝒰) where the lower and upper boundaries are represented. (a)Pphot is the pressure for τ = 1 and (b)Tconnect is the uppermost temperature of the photospheric layer, calculated by setting τ = 0.1 in the Eddington approximation (see Mollière et al. 2020). The priors for T3, T2, and T1 were set to ensure a temperature profile that decreased monotonically with altitude to avoid temperature inversions. (c)log(X˜C)$\log \left( {{{\widetilde {\rm{X}}}_{\rm{C}}}} \right)$ represents the scaling factor for the cloud mass fraction for each of the cloud species used in our retrieval (i.e., Al2O3, Fe, and MgSiO3), defined such that log(X˜C)=0$\log \left( {{{\widetilde {\rm{X}}}_{\rm{C}}}} \right) = 0$ refers to a fraction equal to the equilibrium mass fraction.

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