TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization

Open Access

Table 3

TOI-4438 b parameters from the joint RVs and transit modeling with pyaneti.

Parameter	Prior	Derived value (e = 0)	Derived value (e ≠ 0)
Model parameters
P_orb,b (days)	𝒰[7.2,7.7]	7.44628 ± 0.000009	7.44628 ± 0.000009
T_0,b (BJD_TDB–2450 000)	𝒰[9396.16, 9396.66]	9396.41178 ± 0.00066	9396.41168 ± 0.00065
R_b/R_★	𝒰[0.001,0.09]	0.0613 ± 0.0007	0.062 ± 0.001
b_b	𝒰[0,1]	${0.18}_{- 0.13}^{+ 0.15}$ $0.18_{ - 0.13}^{ + 0.15}$	${0.39}_{- 0.24}^{+ 0.16}$ $0.39_{ - 0.24}^{ + 0.16}$
$\sqrt{e_{b}} \sin ω_{⋆, b}$ $\sqrt {{e_{\rm{b}}}} \sin {\omega _{ \star ,{\rm{b}}}}$	𝒰[−1,1]	0.0	$- {0.31}_{- 0.14}^{+ 0.20}$ $- 0.31_{ - 0.14}^{ + 0.20}$
$\sqrt{e_{b}} \cos ω_{⋆, b}$ $\sqrt {{e_{\rm{b}}}} \cos {\omega _{ \star ,{\rm{b}}}}$	𝒰[−1,1]	0.0	${0.11}_{- 0.19}^{+ 0.14}$ $0.11_{ - 0.19}^{ + 0.14}$
K_b (ms⁻¹)	𝒰[0,50]	3.23 ± 0.69	3.50 ± 0.72

Derived parameters
M_b (M_θ)	⋯	5.1 ± 1.1	5.4 ± 1.1
R_b R_⊕	⋯	2.48 ± 0.12	2.52± 0.13
ρ_b (g cm⁻³)	⋯	${1.80}_{- 0.44}^{+ 0.53}$ $1.80_{ - 0.44}^{ + 0.53}$	${1.85}_{- 0.44}^{+ 0.51}$ $1.85_{ - 0.44}^{ + 0.51}$
a_b (au)	⋯	0.0509 ± 0.0028	0.0534 ± 0.0037
e_b	⋯	0.0	0.14 ± 0.09
ω_★,b (deg)	⋯	0.0	$- 70_{- 32}^{+ 36}$ $- 70_{ - 32}^{ + 36}$
i_b (deg)	⋯	${89.64}_{- 0.31}^{+ 0.25}$ $89.64_{ - 0.31}^{ + 0.25}$	${89.34}_{- 0.21}^{+ 0.39}$ $89.34_{ - 0.21}^{ + 0.39}$
τ_14,b (h)	⋯	2.002 ± 0.018	${2.021}_{- 0.025}^{+ 0.033}$ $2.021_{ - 0.025}^{ + 0.033}$
T_eq,b (K) (α=0)	⋯	446±13	435±15
T_eq,b (K) (α=0.6)	⋯	354± 7	347±5
S_b (S_⊕)	⋯	${6.57}_{- 0.68}^{+ 0.81}$ $6.57_{ - 0.68}^{ + 0.81}$	${6.00}_{- 0.77}^{+ 0.90}$ $6.00_{ - 0.77}^{ + 0.90}$

Additional model parameters
ρ_★ (g cm⁻³)₁	𝒩[10.06,1.62]	${8.92}_{- 0.99}^{+ 0.49}$ $8.92_{ - 0.99}^{ + 0.49}$	${10.1}_{- 1.4}^{+ 1.7}$ $10.1_{ - 1.4}^{ + 1.7}$
γ_CARMENES (ms⁻¹)	𝒰[−2,2]	−0.2 ± 0.5	−0 3 ± 0 5
RV jitter term σ_RV,CARMENES (ms⁻¹)	𝒥[0,100]	${1.48}_{- 0.79}^{+ 0.72}$ $1.48_{ - 0.79}^{ + 0.72}$	${1.33}_{- 0.80}^{+ 0.71}$ $1.33_{ - 0.80}^{ + 0.71}$
Phot. jitter term σ_TESS	𝒥[0,100]	0.000060 ± 0.000055	0 000060 ± 0 000055
Phot. jitter term σ_MuSCAT2i′	𝒥[0,100]	0.00014 ± 0.00011	0.00013 ± 0.00011
Phot. jitter term $σ_{{MuSCAT2 z}_{s}}$ ${\sigma _{{\rm{MuSCAT2 }}{{\rm{z}}_{\rm{s}}}}}$	𝒥[0,100]	0.00018 ± 0.00016	0.00017 ± 0.00016

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