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We present sixteen occultation and three transit light curves for theultra-short period hot Jupiter WASP-103 b, in addition to five new radialvelocity measurements. We combine these observations with archival data andperform a global analysis of the resulting extensive dataset, accounting forthe contamination from a nearby star. We detect the thermal emission of theplanet in both the $z'$ and $K_{\mathrm{S}}$-bands, the measured occultationdepths being 699$\pm$110 ppm (6.4-$\sigma$) and $3567_{-350}^{+400}$ ppm(10.2-$\sigma$), respectively. We use these two measurements together withrecently published HST/WFC3 data to derive joint constraints on the propertiesof WASP-103 b's dayside atmosphere. On one hand, we find that the $z'$-band andWFC3 data are best fit by an isothermal atmosphere at 2900 K or an atmospherewith a low H$_2$O abundance. On the other hand, we find an unexpected excess inthe $K_{\mathrm{S}}$-band measured flux compared to these models, whichrequires confirmation with additional observations before any interpretationcan be given. From our global data analysis, we also derive a broad-bandoptical transmission spectrum that shows a minimum around 700 nm and increasingvalues towards both shorter and longer wavelengths. This is in agreement with aprevious study based on a large fraction of the archival transit light curvesused in our analysis. The unusual profile of this transmission spectrum ispoorly matched by theoretical spectra and is not confirmed by more recentobservations at higher spectral resolution. Additional data, both in emissionand transmission, are required to better constrain the atmospheric propertiesof WASP-103 b.

High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b