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LkCa 15 hosts a pre-transitional disk as well as at least one accretingprotoplanet orbiting in its gap. Previous disk observations have focused mainlyon the outer disk, which is cleared inward of ~50 au. The planet candidates, onthe other hand, reside at orbital radii around 15 au, where disk observationshave been unreliable until recently. Here we present new J-band imagingpolarimetry of LkCa 15 with SPHERE IRDIS, yielding the most accurate anddetailed scattered-light images of the disk to date down to the planet-hostinginner regions. We find what appear to be persistent asymmetric structures inthe scattering material at the location of the planet candidates, which couldbe responsible at least for parts of the signals measured with sparse-aperturemasking. These images further allow us to trace the gap edge in scattered lightat all position angles and search the inner and outer disks for morphologicalsubstructure. The outer disk appears smooth with slight azimuthal variations inpolarized surface brightness, which may be due to shadowing from the inner diskor a two-peaked polarized phase function. We find that the near-side gap edgerevealed by polarimetry matches the sharp crescent seen in previous ADI imagingvery well. Finally, the ratio of polarized disk to stellar flux is more thansix times larger in J-band than in the RI bands.

Resolving the planet-hosting inner regions of the LkCa 15 disk