Detection of Na in the atmosphere of the hot Jupiter HAT-P-55b

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Volume 687 (July 2024)

A&A, 687 (2024) A9

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Table 5

Bayesian model comparison for the free chemistry retrievals.

Species	$Δ ln Z$ $\Delta \ln {\cal Z}$ ^(a)	Significance	Inferences
Na	13.48	5.5σ	Strongly favored
K	−0.39	–	Inconclusive
TiO	−1.46	−2.3σ	Weakly disfavored
VO	−1.38	−2.2σ	Weakly disfavored
H₂O	−0.27	–	Inconclusive
FeH	−0.55	–	Inconclusive
CaH	−2.96	−2.9σ	Moderately disfavored
CrH	−0.47	–	Inconclusive
MgH	4.43	3.4σ	Moderately favored
AlH	−0.08	–	Inconclusive

Notes. ^(a) $Δ ln Z = ln Z_{full} - ln Z_{i}$ $\Delta \ln {\cal Z} = \ln {{\cal Z}_{{\rm{full }}}} - \ln {{\cal Z}_{\rm{i}}}$ , where $ln Z_{full}$ $\ln {{\cal Z}_{{\rm{full }}}}$ is the natural logarithmic evidence of the full model including all species and ln $Z_{i}$ ${{\cal Z}_{\rm{i}}}$ is the natural logarithmic evidence of the model excluding species i. The typical uncertainty of $ln Z$ $\ln {\cal Z}$ in this study is ~0.13.

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