The obliquity and atmosphere of the hot Jupiter WASP-122b (KELT-14b) with ESPRESSO: An aligned orbit and no sign of atomic or molecular absorption
Thanks to their short orbital periods and hot extended atmospheres, hot Jupiters are ideal candidates for atmosphere studies with high- resolution spectroscopy. New stable spectrographs help improve our understanding of the evolution and composition of those types of planets. By analyzing two nights of observations using the ESPRESSO high-resolution spectrograph, we studied the architecture and atmosphere of hot Jupiter WASP-122b (KELT-14b). By analyzing the Rossiter-McLaughlin (RM) effect, we measured the spin-orbit angle of the system to be λ = 0.09 −0.90 +0.88 deg. This result is in line with literature obliquity measurements of planetary systems around stars with effective temperatures cooler than 6500 K. Using the transmission spectroscopy, we studied the atmosphere of the planet. Applying both the single-line analysis and the cross-correlation method, we looked for Ca I , Cr I , FeH, Fe I , Fe II , H 2 O, Li I , Mg I , Na I , Ti I , TiO, V I , VO, and Y I . Our results show no evidence of any of these species in WASP-122b’s atmosphere. The lack of significant detections can be explained by either the RM effect covering the regions where the atmospheric signal is expected and masking it, along with the low signal-to-noise ratio (S/N) of the observations or the absence of the relevant species in its atmosphere.
Authors
- J. V. Seidel (ORCID: https://orcid.org/0000-0002-7990-9596)
- Y. Alibert (ORCID: https://orcid.org/0000-0002-4644-8818)
- M. Steiner (ORCID: https://orcid.org/0000-0003-3036-3585)
- Ε. Πάλλη (ORCID: https://orcid.org/0000-0003-0987-1593)
- M. R. Zapatero Osorio (ORCID: https://orcid.org/0000-0001-5664-2852)
- C. J. A. P. Martins (ORCID: https://orcid.org/0000-0002-4886-9261)
- A. Suárez Mascareño (ORCID: https://orcid.org/0000-0002-3814-5323)
- Romain Allart (ORCID: https://orcid.org/0000-0002-1199-9759)
- Alessandro Sozzetti (ORCID: https://orcid.org/0000-0002-7504-365X)
- P. Figueira
- N. Casasayas-Barris (ORCID: https://orcid.org/0000-0002-2891-8222)
- F. Borsa (ORCID: https://orcid.org/0000-0003-4830-0590)
- J. I. Gónzalez Hernández (ORCID: https://orcid.org/0000-0002-0264-7356)
- T. Azevedo Silva (ORCID: https://orcid.org/0000-0002-9379-4895)
- N. C. Santos
- E. Esparza-Borges (ORCID: https://orcid.org/0000-0002-2341-3233)
- M. Stangret (ORCID: https://orcid.org/0000-0002-1812-8024)
- E. Cristo (ORCID: https://orcid.org/0000-0001-5992-7589)
- S. Udry (ORCID: https://orcid.org/0000-0001-7576-6236)
- E. Herrero-Cisneros (ORCID: https://orcid.org/0000-0002-9990-6915)
- O. D. S. Demangeon (ORCID: https://orcid.org/0000-0001-7918-0355)
- P. Di Marcantonio
- J. Orell Miquel
- D. Ehrenreich
Institutions
- University of Geneva (CH)
- University of Bern (CH)
- Bern University of Applied Sciences (CH)
- Universidad de La Laguna (ES)
- Universidade do Porto (PT)
- Arcetri Astrophysical Observatory (IT)
- Trieste Astronomical Observatory (IT)
- Brera Astronomical Observatory (IT)
- Institute of Astrophysics and Space Sciences (PT)
- Osservatorio Astrofisico di Torino (IT)
- Centro de Astrofísica da Universidade do Porto (PT)
- Centro de Astrobiología (ES)
- European Southern Observatory (CL)
- Instituto de Astrofísica de Canarias (ES)
- Osservatorio Astronomico di Padova (IT)
- Université de Montréal (CA)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2024-10-02
- DOI
- https://doi.org/10.1051/0004-6361/202450938
- Citations
- 2
- Primary Topic
- Astro and Planetary Science
- Type
- article
- Field-Weighted Citation Impact
- 0.66