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We report new detections of thermal emission from the transiting hot JupiterWASP-43b in the H and Ks-bands as observed at secondary eclipses. Theobservations were made with the WIRCam instrument on the CFHT. We obtained asecondary eclipse depth of 0.103$_{-0.017}^{+0.017}%$ and0.194$_{-0.029}^{+0.029}%$ in the H and Ks-bands, respectively. The Ks banddepth is consistent with previous measurement in the narrow band centered at2.09um by Gillon et al. (2012). Our eclipse depths in both bands are consistentwith a blackbody spectrum with a temperature of ~1850 K, slightly higher thanthe dayside equilibrium temperature without day-night energy redistribution.Based on theoretical models of the dayside atmosphere of WASP-43b, our dataconstrain the day-night energy redistribution in the planet to be $\lesssim15-25$%, depending on the metal content in the atmosphere. Combined with energybalance arguments our data suggest that a strong temperature inversion isunlikely in the dayside atmosphere of WASP-43b. However, a weak inversioncannot be strictly ruled out at the current time. Future observations arerequired to place detailed constraints on the chemical composition of theatmosphere.

Ground-based detections of thermal emission from the dense hot Jupiter WASP-43b in H and Ks-bands