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We present simultaneous multi-color optical photometry using ULTRACAM of thetransiting exoplanet KIC 12557548 b (also known as KIC 1255 b). This reveals,for the first time, the color dependence of the transit depth. Our g and ztransits are similar in shape to the average Kepler short-cadence profile, andconstitute the highest-quality extant coverage of individual transits. OurNight 1 transit depths are 0.85 +/- 0.04% in z; 1.00 +/- 0.03% in g; and 1.1+/- 0.3% in u. We employ a residual-permutation method to assess the impact ofcorrelated noise on the depth difference between the z and g bands andcalculate the significance of the color dependence at 3.2{\sigma}. The Night 1depths are consistent with dust extinction as observed in the ISM, but requiregrain sizes comparable to the largest found in the ISM: 0.25-1{\mu}m. Thisprovides direct evidence in favor of this object being a disrupting low-massrocky planet, feeding a transiting dust cloud. On the remaining four nights ofobservations the object was in a rare shallow-transit phase. If the grain sizein the transiting dust cloud changes as the transit depth changes, theextinction efficiency is expected to change in a wavelength- andcomposition-dependent way. Observing a change in the wavelength-dependenttransit depth would offer an unprecedented opportunity to determine thecomposition of the disintegrating rocky body KIC 12557548 b. We detected fourout-of-transit u band events consistent with stellar flares.

Direct evidence for an evolving dust cloud from the exoplanet KIC 12557548 b