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

Ahrer, E ; Seidel, J V ; Doyle, L ; Gandhi, S ; Prinoth, B LU orcid ; Cegla, H M ; McDonald, C H ; Astudillo-Defru, N ; Ayache, E and Nealon, R , et al. (2024) In Monthly Notices of the Royal Astronomical Society 530(3). p.2749-2759
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Monthly Notices of the Royal Astronomical Society
volume
530
issue
3
pages
11 pages
publisher
Oxford University Press
external identifiers
  • scopus:85192395116
ISSN
1365-2966
DOI
10.1093/mnras/stae1000
language
English
LU publication?
yes
id
c60b0f01-ba6b-4921-b138-d2a1ccb18703
date added to LUP
2024-11-21 13:50:30
date last changed
2025-04-04 15:20:43
@article{c60b0f01-ba6b-4921-b138-d2a1ccb18703,
  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.}},
  author       = {{Ahrer, E and Seidel, J V and Doyle, L and Gandhi, S and Prinoth, B and Cegla, H M and McDonald, C H and Astudillo-Defru, N and Ayache, E and Nealon, R and Veras, Dimitri and Wheatley, P J and Ehrenreich, D}},
  issn         = {{1365-2966}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{3}},
  pages        = {{2749--2759}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS}},
  url          = {{http://dx.doi.org/10.1093/mnras/stae1000}},
  doi          = {{10.1093/mnras/stae1000}},
  volume       = {{530}},
  year         = {{2024}},
}