A sufficiently thick disk (﹩\max {i}_{{\rm{p,free}}}=0.15\,{\rm{rad}};﹩ bottom panel) seen edge-on features a “ship” (inner white contour of constant surface brightness) and its surrounding “wake” (outer white contour). The ship’s front/bow (on the positive x-axis, aligned with the underlying planet’s periastron) is brighter than its back/stern. The outer wake is narrower at its front than its back. The ship-and-wake morphology might be relevant for HD 106906; see Section 4.