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This work presents a re-analysis of the spectroscopic phase-curveobservations of the ultra hot Jupiter WASP-103 b obtained by the Hubble SpaceTelescope (HST) and the Spitzer Telescope. Traditional 1D and unified 1.5Dspectral retrieval techniques are employed, allowing to map the thermalstructure and the abundances of trace gases in this planet as a function oflongitude. On the day-side, the atmosphere is found to have a strong thermalinversion, with indications of thermal dissociation traced by continuum H-opacity. Water vapor is found across the entire atmosphere but with depletedabundances of around 1e-5, consistent with the thermal dissociation of thismolecule. Regarding metal oxide and hydrides, FeH is detected on the hot-spotand the day-side of WASP-103 b, but TiO and VO are not present in detectablequantities. Carbon-bearing species such as CO and CH4 are also found, but sincetheir detection is reliant on the combination of HST and Spizer, the retrievedabundances should be interpreted with caution. Free and Equilibrium chemistryretrievals are overall consistent, allowing to recover robust constraints onthe metallicity and C/O ratio for this planet. The analyzed phase-curve dataindicates that the atmosphere of WASP-103 b is consistent with solar elementalratios.

On spectroscopic phase-curve retrievals: H2 dissociation and thermal inversion in the atmosphere of the ultra-hot Jupiter WASP-103 b