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We present Ks, H & J-band photometry of the very highly irradiated hotJupiter WASP-12b using the Wide-field Infrared Camera on theCanada-France-Hawaii telescope. Our photometry brackets the secondary eclipseof WASP-12b in the Ks and H-bands, and in J-band starts in mid-eclipse andcontinues until well after the end of the eclipse. We detect its thermalemission in all three near-infrared bands. Our secondary eclipse depths are0.309 +/- 0.013% in Ks-band (24-sigma), 0.176 +/- 0.020% in H-band (9-sigma)and 0.131 +/- 0.028% in J-band (4-sigma). All three secondary eclipses arebest-fit with a consistent phase that is compatible with a circular orbit. Bycombining our secondary eclipse times with others published in the literature,as well as the radial velocity and transit timing data for this system, we showthat there is no evidence that WASP-12b is precessing at a detectable rate, andshow that its orbital eccentricity is likely zero. Our thermal emissionmeasurements also allow us to constrain the characteristics of the planet'satmosphere; our Ks-band eclipse depth argues in favour of inefficient day tonightside redistribution of heat and a low Bond albedo for this very highlyirradiated hot Jupiter. The J and H-band brightness temperatures are slightlycooler than the Ks-band brightness temperature, and thus hint at thepossibility of a modest temperature inversion deep in the atmosphere ofWASP-12b; the high pressure, deep atmospheric layers probed by our J and H-bandobservations are likely more homogenized than the higher altitude layer.Lastly, our best-fit Ks-band eclipse has a marginally longer duration thanwould otherwise be expected; this may be tentative evidence for material beingtidally stripped from the planet - as was predicted for this system by Li &collaborators, and for which observational confirmation was recently arguablyprovided by Fossati & collaborators.

Near-infrared Thermal Emission from WASP-12b: detections of the secondary eclipse in Ks, H & J