Phase-folded long-cadence Kepler light curve of KIC 1255b (bottom), together with schematic views of the system at different orbital phases (top), illustrating how an asymmetric dust cloud can explain the peculiar transit profile. Arrows indicate which sketch corresponds to which orbital phase. For details on the observational data, see Sect. 2.3.1 of this work and Sect. 2 of van Werkhoven et al. (2014). The error bars on flux include the spread caused by the variability in transit depth, making the in-transit error bars greater than the out-of-transit ones (which are mostly smaller than the size of the symbols). In the sketches, the star, the orbit of the planet, and the length of the dust tail are all drawn to scale; the tick marks on the axes are spaced one stellar radius apart. The vertical thickness of the dust cloud and its colour gradient (which illustrates the gradually decreasing dust density) are chosen for illustrative purposes.