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Secondary eclipses are a powerful tool to measure directly the thermalemission from extrasolar planets, and to constrain their type and physicalparameters. We started a project to obtain reliable broad-band measurements ofthe thermal emission of transiting exoplanets. Ground-based high-cadencenear-infrared relative photometry was used to obtain sub-millimagnitudeprecision light curve of a secondary eclipse of WASP-4b -- a 1.12 M_J hotJupiter on a 1.34 day orbit around G7V star. The data show a clear ~10-\sigmadetection of the planet's thermal emission at 2.2 \mu m. The calculated thermalemission corresponds to a fractional eclipse depth of 0.185^{+0.014}_{-0.013}%,with a related brightness temperature in Ks of T_B = 1995 \pm 40 K, centered atT_C = 2455102.61162^{+0.00071}_{-0.00077} HJD. We could set a limit on theeccentricity of e cos \omega=0.0027 \pm 0.0018, compatible with a near-circularorbit. The calculated brightness temperature, as well as the specific modelssuggest a highly inefficient redistribution of heat from the day-side to thenight-side of the planet, and a consequent emission mainly from the day-side.The high-cadence ground-based technique is capable of detecting the faintsignal of the secondary eclipse of extrasolar planets, making it a valuablecomplement to space-based mid-IR observations.

A ground-based Ks-band detection of the thermal emission from the transiting exoplanet WASP-4b