M. Stangret, E. Palle, E. Esparza-Borges, J. Orell-Miquel, N. Casasayas-Barris, M. R. Zapatero Osorio, E. A. S. Cristo, R. Allart, Y. Alibert, F. Borsa, O. Demangeon, P. Di Marcantonio, D. Ehrenreich, P. Figueira, J. I. González Hernández, E. Herrero-Cisneros, C. J. A. P. Martins, N. C. Santos, J. V. Seidel, T. de Azevedo Silva, A. Sozzetti, M. Rosensteiner, A. Suárez Mascareño, S. Udry
Abstract
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, H2O, 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.
Keywords
methods: observational / techniques: spectroscopic / planets and satellites: atmospheres / planets and satellites: individual: WASP-122b / planets and satellites: individual: KELT-14b
Notes
Based on Guaranteed Time Observations collected at the European Southern Observatory under ESO program 106.21M2.004 by the ESPRESSO Consortium.
Astronomy & Astrophysics
Volume 691, Article Number A120, Number of pages 19
2025 November
