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We report a detection of thermal emission from the hot Jupiter WASP-48b inthe $K_{\rm s}$-band. We used the Wide-field Infra-red Camera on the 3.6-mCanada-France Hawaii Telescope to observe an occultation of the planet by itshost star. From the resulting occultation lightcurve we find a planet-to-starcontrast ratio in the Ks-band of $0.136 \pm 0.014\,\%$ , in agreement with thevalue of $0.109 \pm 0.027\,\%$ previously determined. We fit the two Ks-bandoccultation lightcurves simultaneously with occultation lightcurves in the$H$-band and the Spitzer 3.6-{\mu}m and 4.5-{\mu}m bandpasses, radial velocitydata, and transit lightcurves. From this, we revise the system parameters andconstruct the spectral energy distribution (SED) of the dayside atmosphere. Bycomparing the SED with atmospheric models, we find that both models with andwithout a thermal inversion are consistent with the data. We find the planet'sorbit to be consistent with circular ($e < 0.072$ at 3$\sigma$).

Thermal emission of WASP-48b in the Ks-band