Atmospheric characterisation and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS

• DOI: 10.48550/arxiv.2404.06550
• Publication Date: 2024-04-09
• Authors: Eva-Maria Ahrer; J. V. Seidel; L. Doyle; Siddharth Gandhi; B. Prinoth; H. M. Cegla; Catriona H McDonald; N. Astudillo-Defru; Eliot H. Ayache; Rebecca Nealon; Dimitri Veras; P. J. Wheatley; D. Ehrenreich
• Keywords: Orbit (dynamics); Spectral resolution; Sigma

We present high spectral resolution observations of the hot Jupiter WASP-94 A b using HARPS instrument on ESO's 3.6m telescope in La Silla, Chile. probed for Na absorption its atmosphere as well constrained previously reported misaligned retrograde orbit Rossiter-McLaughlin effect. Additionally, we undertook a combined atmospheric retrieval analysis with published low-resolution data. confirm constrain orbital misalignment our measurement projected spin-orbit obliquity $\lambda = 123.0 \pm 3.0 ^\circ$. find tentative detection b, independent treatment effect (3.6$\sigma$ and 4.4$\sigma$). combine data low from literature that while posterior distribution abundance results tighter constraint than single set, significance does not improve (3.2$\sigma$), which attribute to degeneracies between