Evidence for stellar contamination and water absorption in NGTS-5b’s transmission spectra with GTC/OSIRIS

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Table 2

Priors and derived posteriors for the parameters used in the white light curve analyses.

Parameter	Prior	Posterior estimate
P (d)	fixed	3.3569866
i (^◦)	𝒰(80, 90)	${87.377}_{- 0.088}^{+ 0.091}$ $Mathematical equation: $87.377_{ - 0.088}^{ + 0.091}$$
a/R_⋆	𝒰(5, 20)	${12.262}_{- 0.130}^{+ 0.145}$ $Mathematical equation: $12.262_{ - 0.130}^{ + 0.145}$$
R_p/R_⋆	𝒰(0, 0.3)	${0.14861}_{- 0.00204}^{+ 0.00191}$ $Mathematical equation: $0.14861_{ - 0.00204}^{ + 0.00191}$$

2020-03-10 (Night 1)
t_c (MJD^a)	𝒰(−0.02, 0.02)	${0.00109}_{- 0.00038}^{+ 0.00040}$ $Mathematical equation: $0.00109_{ - 0.00038}^{ + 0.00040}$$
u₁	Fixed	1.06645
u₂	Fixed	−1.59440
u₃	Fixed	2.28615
u₄	Fixed	−0.89105
c₀	𝒰(−∞, +∞)	${1.00852}_{- 0.00045}^{+ 0.00044}$ $Mathematical equation: $1.00852_{ - 0.00045}^{ + 0.00044}$$
c₁	𝒰(−∞, +∞)	$- {0.08214}_{- 0.00292}^{+ 0.00300}$ $Mathematical equation: $ - 0.08214_{ - 0.00292}^{ + 0.00300}$$
c₂	𝒰(−∞, +∞)	$- {0.41182}_{- 0.08908}^{+ 0.08536}$ $Mathematical equation: $ - 0.41182_{ - 0.08908}^{ + 0.08536}$$
σ_w (10⁻⁶)	𝒰(0.1, 5000)	${0.00046}_{- 0.00003}^{+ 0.00004}$ $Mathematical equation: $0.00046_{ - 0.00003}^{ + 0.00004}$$
ln σ_k	𝒰(−10, −1)	$- {7.06447}_{- 0.37981}^{+ 0.27910}$ $Mathematical equation: $ - 7.06447_{ - 0.37981}^{ + 0.27910}$$
ln τ_t	𝒰(−6, 5)	$- {3.79902}_{- 0.37174}^{+ 0.34960}$ $Mathematical equation: $ - 3.79902_{ - 0.37174}^{ + 0.34960}$$
ln τ_x	𝒰(−5, 5)	${3.08645}_{- 1.34064}^{+ 1.05288}$ $Mathematical equation: $3.08645_{ - 1.34064}^{ + 1.05288}$$
ln τ_y	𝒰(−5, 5)	${3.03125}_{- 1.24824}^{+ 1.22712}$ $Mathematical equation: $3.03125_{ - 1.24824}^{ + 1.22712}$$
ln $τ_{s_{y}}$ $Mathematical equation: ${\tau _{{s_y}}}$$	𝒰(−5, 5)	${1.87409}_{- 0.45994}^{+ 0.66805}$ $Mathematical equation: $1.87409_{ - 0.45994}^{ + 0.66805}$$
ln τ_θ	𝒰(−5, 5)	${3.10147}_{- 0.92081}^{+ 0.94035}$ $Mathematical equation: $3.10147_{ - 0.92081}^{ + 0.94035}$$

2021-03-21 (Night 2)
t_c (MJD^a)	𝒰(−0.02, 0.02)	${0.00179}_{- 0.00015}^{+ 0.00015}$ $Mathematical equation: $0.00179_{ - 0.00015}^{ + 0.00015}$$
u₁	Fixed	1.06645
u₂	Fixed	−1.59440
u₃	Fixed	2.28615
u₄	Fixed	−0.89105
c₀	𝒰(−∞, +∞)	${0.99822}_{- 0.00018}^{+ 0.00017}$ $Mathematical equation: $0.99822_{ - 0.00018}^{ + 0.00017}$$
c₁	𝒰(−∞, +∞)	${0.03096}_{- 0.00095}^{+ 0.00090}$ $Mathematical equation: $0.03096_{ - 0.00095}^{ + 0.00090}$$
c₂	𝒰(−∞, +∞)	${0.18407}_{- 0.02165}^{+ 0.02176}$ $Mathematical equation: $0.18407_{ - 0.02165}^{ + 0.02176}$$
σ_w (10⁻⁶)	𝒰(0.1, 5000)	${0.00034}_{- 0.00002}^{+ 0.00002}$ $Mathematical equation: $0.00034_{ - 0.00002}^{ + 0.00002}$$
ln σ_k	𝒰(−10, −1)	$- {6.32446}_{- 0.84631}^{+ 0.53665}$ $Mathematical equation: $ - 6.32446_{ - 0.84631}^{ + 0.53665}$$
ln τ_t	𝒰(−6, 5)	$- {1.21432}_{- 1.10322}^{+ 0.85693}$ $Mathematical equation: $ - 1.21432_{ - 1.10322}^{ + 0.85693}$$
ln τ_x	𝒰(−5, 5)	${4.15940}_{- 1.22978}^{+ 0.57947}$ $Mathematical equation: $4.15940_{ - 1.22978}^{ + 0.57947}$$
ln τ_y	𝒰(−5, 5)	${3.55239}_{- 1.41149}^{+ 1.00672}$ $Mathematical equation: $3.55239_{ - 1.41149}^{ + 1.00672}$$
ln $τ_{s_{y}}$ $Mathematical equation: ${\tau _{{s_y}}}$$	𝒰(−5, 5)	${2.18247}_{- 0.85872}^{+ 0.53245}$ $Mathematical equation: $2.18247_{ - 0.85872}^{ + 0.53245}$$
ln τ_θ	𝒰(−5, 5)	${4.14256}_{- 0.45817}^{+ 0.42534}$ $Mathematical equation: $4.14256_{ - 0.45817}^{ + 0.42534}$$

Notes. ^(a)MJD = BJD_TDB − 2457740.35262.

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