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We report the discovery of a photometric variability in the bright T2.5 browndwarf SIMP J013656.5+093347. Continuous J-band photometry has been obtained forseveral hours on four different nights. The light curves show a periodicmodulation with a period of ~2.4 hours, a peak-to-peak amplitude of ~50 mmagand significant night-to-night evolution. We suggest that the light curvemodulation is due to the brown dwarf's rotation and that the longer termvariations come from surface features evolution and/or differential rotation.We obtained complementary observations over a single night in the J and Ksbands; the object displays correlated photometric variability in both bands,albeit with smaller Ks-band amplitude. The ratio of the Ks and J variabilityamplitudes puts strong constraints on the physical mechanisms at play. Based ontheoretical models of brown dwarf atmospheres, our results suggest that theatmosphere of SIMP0136 is comprised of both grain-free and colder (by ~100 K)grain-bearing cloudy regions. This discovery, and its interpretation, provide anatural explanation of the so-called J-band brightening.

Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347; Evidence for Evolving Weather Patterns