How do wavelength correlations affect transmission spectra? Application of a new fast and flexible 2D Gaussian process framework to transiting exoplanet spectroscopy

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Volume 686 (June 2024)

A&A, 686 (2024) A89

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Table 5

Results of atmospheric retrievals on the 600RI data analysed by different methods.

Method	Mean radius $(\bar{ρ})$ $\[(\bar{\rho})\]$	Slope (α)	Δρ_Na	Δρ_κ	$χ_{r}^{2}$ $\[\chi_{\mathrm{r}}^2\]$
Gibson et al. (2017) spectrum	0.12539 ± 0.00025	4.68 ± 2.04	0.00039 ± 0.00195	0.00059 ± 0.00143	0.31
1D re-analysis	0.12493 ± 0.00021	5.27 ± 1.64	0.00070 ± 0.00147	0.00061 ± 0.00110	0.47
Analogous 2D GP Analysis	0.12484 ± 0.00036	8.09 ± 8.02	0.00123 ± 0.00074	0.00100 ± 0.00062	1.85
2D GP: without mean radius prior	0.08687 ± 0.00896	11.2 ± 12.1	0.00156 ± 0.00090	0.00139 ± 0.00073	1.58
2D GP: varying T₀, a/R_, b*	0.12488 ± 0.00034	8.42 ± 8.44	0.00097 ± 0.00072	0.00111 ± 0.00061	1.68
2D GP: direct atmospheric retrieval	0.12485 ± 0.00036	−1.87 ± 10.9	0.00118 ± 0.00088	0.00094 ± 0.00074	N/A

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