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We present twenty-three transit light curves and seven occultation lightcurves for the ultra-short period planet WASP-43 b, in addition to eight newmeasurements of the radial velocity of the star. Thanks to this extensive dataset, we improve significantly the parameters of the system. Notably, thelargely improved precision on the stellar density (2.41+-0.08 rho_sun) combinedwith constraining the age to be younger than a Hubble time allows us to breakthe degeneracy of the stellar solution mentioned in the discovery paper. Theresulting stellar mass and size are 0.717+-0.025 M_sun and 0.667+-0.011 R_sun.Our deduced physical parameters for the planet are 2.034+-0.052 M_jup and1.036+-0.019 R_jup. Taking into account its level of irradiation, the highdensity of the planet favors an old age and a massive core. Our deduced orbitaleccentricity, 0.0035(-0.0025,+0.0060), is consistent with a fully circularizedorbit. We detect the emission of the planet at 2.09 microns at better than11-sigma, the deduced occultation depth being 1560+-140 ppm. Our detection ofthe occultation at 1.19 microns is marginal (790+-320 ppm) and moreobservations are needed to confirm it. We place a 3-sigma upper limit of 850ppm on the depth of the occultation at ~0.9 microns. Together, these resultsstrongly favor a poor redistribution of the heat to the night-side of theplanet, and marginally favor a model with no day-side temperature inversion.

The TRAPPIST survey of southern transiting planets. I. Thirty eclipses of the ultra-short period planet WASP-43 b