Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide - INSU - Institut national des sciences de l'Univers
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2024

Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide

Jingxuan Yang
  • Fonction : Auteur
Mark Hammond
  • Fonction : Auteur
Anjali A. A. Piette
  • Fonction : Auteur
Jasmina Blecic
  • Fonction : Auteur
Taylor J. Bell
  • Fonction : Auteur
Patrick G. J. Irwin
  • Fonction : Auteur
Shang-Min Tsai
  • Fonction : Auteur
Joanna K. Barstow
  • Fonction : Auteur
Nicolas Crouzet
  • Fonction : Auteur
Laura Kreidberg
  • Fonction : Auteur
João M. Mendonça
  • Fonction : Auteur
Jake Taylor
  • Fonction : Auteur
Robin Baeyens
  • Fonction : Auteur
Kazumasa Ohno
  • Fonction : Auteur
Matthew C. Nixon
  • Fonction : Auteur

Résumé

Spectroscopic phase curves of hot Jupiters measure their emission spectra at multiple orbital phases, thus enabling detailed characterization of their atmospheres. Precise constraints on the atmospheric composition of these exoplanets offer insights into their formation and evolution. We analyse four phase-resolved emission spectra of the hot Jupiter WASP-43b, generated from a phase curve observed with the Mid-Infrared Instrument/Low Resolution Spectrometer onboard the JWST, to retrieve its atmospheric properties. Using a parametric 2D temperature model and assuming a chemically homogeneous atmosphere within the observed pressure region, we simultaneously fit the four spectra to constrain the abundances of atmospheric constituents, thereby yielding more precise constraints than previous work that analysed each spectrum independently. Our analysis reveals statistically significant evidence of NH$_3$ (4$\sigma$) in a hot Jupiter's emission spectra for the first time, along with evidence of H$_2$O (6.5$\sigma$), CO (3.1$\sigma$), and a non-detection of CH$_4$. With our abundance constraints, we tentatively estimate the metallicity of WASP-43b at 0.6$-6.5\times$ solar and its C/O ratio at 0.6$-$0.9. Our findings offer vital insights into the atmospheric conditions and formation history of WASP-43b by simultaneously constraining the abundances of carbon, oxygen, and nitrogen-bearing species.
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insu-04729851 , version 1 (10-10-2024)

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Jingxuan Yang, Mark Hammond, Anjali A. A. Piette, Jasmina Blecic, Taylor J. Bell, et al.. Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide. Monthly Notices of the Royal Astronomical Society, 2024, 532, pp.460-475. ⟨10.1093/mnras/stae1427⟩. ⟨insu-04729851⟩

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