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High angular resolution observations of young stellar objects are required tostudy the inner astronomical units of protoplanetary disks in which themajority of planets form. As they evolve, gaps open up in the inner diskregions and the disks are fully dispersed within ~10 Myrs. MWC 614 is apre-transitional object with a ~10au radius gap. We present a set of highangular resolution observations of this object including SPHERE/ZIMPOLpolarimetric and coronagraphic images in the visible, KECK/NIRC2 near-infraredaperture masking observations and VLTI (AMBER, MIDI, and PIONIER) and CHARA(CLASSIC and CLIMB) long-baseline interferometry at infrared wavelengths. Wefind that all the observations are compatible with an inclined disk (i ~55degat a position angle of ~20-30deg). The mid-infrared dataset confirms the diskinner rim to be at 12.3+/-0.4 au from the central star. We determined an uppermass limit of 0.34 Msun for a companion inside the cavity. Within the cavity,the near-infrared emission, usually associated with the dust sublimationregion, is unusually extended (~10 au, 30 times larger than the theoreticalsublimation radius) and indicates a high dust temperature (T~1800 K). As apossible result of companion-induced dust segregation, quantum heated dustgrains could explain the extended near-infrared emission with this hightemperature. Our observations confirm the peculiar state of this object wherethe inner disk has already been accreted onto the star exposing small particlesinside the cavity to direct stellar radiation.

A multi-instrument and multi-wavelength high angular resolution study of MWC614: quantum heated particles inside the disk cavity