Khalafinejad 1 ,2 , K. Molaverdikhani 1 ,2 , J. Blecic 3 ,4 , M. Mallonn 5 , L. Nortmann 6 , J. Caballero 7 , H. Rahmati 8 , A. Kaminski 1 , S. Sadegi 1 ,2 , E. Nagel 9 ,10 , L. Carone 2 , P. Amado 11 , M. Azzaro 12 , F. Bauer 11 , N. Casasayas-Barris 13 , S. Czesla 9 , C. Fossati 16 , M. Henning 2 , M. Lendl 16 ,18 , T. Montes 20 , M. Oshagh 21 ,22 , E. Quirrenbach 1 , S. Reffert 1 , A. Reiners 6 , I. Ribas 23 ,24 , S. Stock 1 , F.
Zapatero Osorio 25 and M. Zechmeister 6. Received: 27 April Accepted: 24 August Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres. In studies of transmission spectra, the continuum information is well established with low-resolution spectra, while the shapes of individual lines are best constrained with high-resolution observations.
In this work, we aim to merge high- with low-resolution transmission spectroscopy to place tighter constraints on physical parameters of the atmospheres. Our modelling of WFC3 and OSIRIS data suggests strong Rayleigh scattering, solar to super-solar water abundance, and a highly muted Na feature in the atmosphere of this planet, in agreement with previous investigations of this target. We use the continuum information retrieved from the low-resolution spectroscopy as a prior to break the degeneracy between the Na abundance, reference pressure, and thermosphere temperature for the high-resolution spectroscopic analysis.
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