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Ahrer, E; Seidel, J V; Doyle, L; Gandhi, S; Prinoth, B; Cegla, H M; McDonald, C H; Astudillo-Defru, N; Ayache, E; Nealon, R; Veras, Dimitri; Wheatley, P J; Ehrenreich, D
Monthly notices of the Royal Astronomical Society, 04/2024, Letnik: 530, Številka: 3Journal Article
ABSTRACT We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO’s 3.6-m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously reported misaligned retrograde orbit using the Rossiter–McLaughlin effect. Additionally, we undertook a combined atmospheric retrieval analysis with previously published low-resolution data. We confirm the retrograde orbit as well as constrain the orbital misalignment with our measurement of a projected spin-orbit obliquity of λ = 123.0 ± 3.0°. We find a tentative detection of Na absorption in the atmosphere of WASP-94 A b, independent of the treatment of the Rossiter–McLaughlin effect in our analysis (3.6σ and 4.4σ). We combine our HARPS high-resolution data with low-resolution data from the literature and find that while the posterior distribution of the Na abundance results in a tighter constraint than using a single data set, the detection significance does not improve (3.2σ), which we attribute to degeneracies between the low- and high-resolution data.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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