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We report new Ks band secondary eclipse observations for the hot-JupitersWASP-19b and WASP-43b. Using the IRIS2 infrared camera on the Anglo-AustralianTelescope (AAT), we measured significant secondary eclipses for both planets,with depths of 0.287 -0.020/+0.020% and 0.181 -0.027/+0.027% for WASP-19b andWASP-43b respectively. We compare the observations to atmosphere models fromthe VSTAR line-by-line radiative transfer code, and examine the effect of C/Oabundance, top layer haze, and metallicities on the observed spectra. Weperformed a series of signal injection and recovery exercises on the observedlight curves to explore the detection thresholds of the AAT+IRIS2 facility. Wefind that the optimal photometric precision is achieved for targets brighterthan Kmag = 9, for which eclipses as shallow as 0.05% are detectable at >5sigma significance.

Ks band secondary eclipses of WASP-19b and WASP-43b with the Anglo-Australian Telescope