High angular resolution observations of young stellar objects are required to study the inner astronomical units of protoplanetary disks in which the majority of planets form .
As they evolve , gaps open up in the inner disk regions and the disks are fully dispersed within \sim 10 Myrs . \object MWC 614 is a pre-transitional object with a \sim 10 au radius gap .
We present a set of high angular resolution observations of this object including SPHERE/ZIMPOL polarimetric and coronagraphic images in the visible , KECK/NIRC2 near-infrared aperture masking observations and VLTI ( AMBER , MIDI , and PIONIER ) and CHARA ( CLASSIC and CLIMB ) long-baseline interferometry at infrared wavelengths .
We find that all the observations are compatible with an inclined disk ( i \sim 55 ^ { \circ } at a position angle of \sim 20-30 ^ { \circ } ) .
The mid-infrared dataset confirms the disk inner rim to be at 12.3 \pm 0.4 au from the central star .
We determined an upper mass limit of 0.34 M _ { \odot } for a companion inside the cavity .
Within the cavity , the near-infrared emission , usually associated with the dust sublimation region , is unusually extended ( \sim 10 au , 30 times larger than the theoretical sublimation radius ) and indicates a high dust temperature ( T \sim 1800 K ) .
As a possible result of companion-induced dust segregation , quantum heated dust grains could explain the extended near-infrared emission with this high temperature .
Our observations confirm the peculiar state of this object where the inner disk has already been accreted onto the star exposing small particles inside the cavity to direct stellar radiation .