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We present thermal phase curve measurements for the hot Jupiter WASP-103bobserved with Hubble/WFC3 and Spitzer/IRAC. The phase curves have largeamplitudes and negligible hotspot offsets, indicative of poor heatredistribution to the nightside. We fit the phase variation with a range ofclimate maps and find that a spherical harmonics model generally provides thebest fit. The phase-resolved spectra are consistent with blackbodies in theWFC3 bandpass, with brightness temperatures ranging from $1880\pm40$ K on thenightside to $2930 \pm 40$ K on the dayside. The dayside spectrum has asignificantly higher brightness temperature in the Spitzer bands, likely due toCO emission and a thermal inversion. The inversion is not present on thenightside. We retrieved the atmospheric composition and found the compositionis moderately metal-enriched ($\mathrm{[M/H]} = 23^{+29}_{-13}\times$ solar)and the carbon-to-oxygen ratio is below 0.9 at $3\,\sigma$ confidence. Incontrast to cooler hot Jupiters, we do not detect spectral features from water,which we attribute to partial H$_2$O dissociation. We compare the phase curvesto 3D general circulation models and find magnetic drag effects are needed tomatch the data. We also compare the WASP-103b spectra to brown dwarfs and youngdirectly imaged companions and find these objects have significantly largerwater features, indicating that surface gravity and irradiation environmentplay an important role in shaping the spectra of hot Jupiters. These resultshighlight the 3D structure of exoplanet atmospheres and illustrate theimportance of phase curve observations for understanding their complexchemistry and physics.

Global Climate and Atmospheric Composition of the Ultra-Hot Jupiter WASP-103b from HST and Spitzer Phase Curve Observations