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Shadows in transitional disks are generally interpreted as signs of amisaligned inner disk. This disk is usually beyond the reach of current dayhigh contrast imaging facilities. However, the location and morphology of theshadow features allow us to reconstruct the inner disk geometry. We deriveanalytic equations of the locations of the shadow features as a function of theorientation of the inner and outer disk and the height of the outer disk wall.In contrast to previous claims in the literature, we show that the positionangle of the line connecting the shadows cannot be directly related to theposition angle of the inner disk. We show how the analytic framework derivedhere can be applied to transitional disks with shadow features. We useestimates of the outer disk height to put constraints on the inner diskorientation. In contrast with the results from Long et al. (2017), we derivethat for the disk surrounding HD100453 the analytic estimates andinterferometric observations result in a consistent picture of the orientationof the inner disk. The elegant consistency in our analytic framework betweenobservation and theory strongly support both the interpretation of the shadowfeatures as coming from a misaligned inner disk as well as the diagnostic valueof near infrared interferometry for inner disk geometry.

Connecting the shadows: probing inner disk geometries using shadows in transitional disks