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We present detections of the near-infrared thermal emission of three hotJupiters and one brown-dwarf using the Wide-field Infrared Camera (WIRCam) onthe Canada-France-Hawaii Telescope (CFHT). These include Ks-band secondaryeclipse detections of the hot Jupiters WASP-3b and Qatar-1b and the brown dwarfKELT-1b. We also report Y-band, $K_{CONT}$-band, and two new and one reanalyzedKs-band detections of the thermal emission of the hot Jupiter WASP-12b. Wepresent a new reduction pipeline for CFHT/WIRCam data, which is optimized forhigh precision photometry. We also describe novel techniques for constrainingsystematic errors in ground-based near-infrared photometry, so as to returnreliable secondary eclipse depths and uncertainties. We discuss the noiseproperties of our ground-based photometry for wavelengths spanning thenear-infrared (the YJHK-bands), for faint and bright-stars, and for the sameobject on several occasions. For the hot Jupiters WASP-3b and WASP-12b wedemonstrate the repeatability of our eclipse depth measurements in the Ks-band;we therefore place stringent limits on the systematics of ground-based,near-infrared photometry, and also rule out violent weather changes in thedeep, high pressure atmospheres of these two hot Jupiters at the epochs of ourobservations.

Near-infrared Thermal Emission Detections of a number of hot Jupiters and the Systematics of Ground-based Near-infrared Photometry