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Context. Based on the far infrared excess the Herbig class of stars isdivided into a group with flaring circumstellar disks (group I) and a groupwith flat circumstellar disks (group II). Dust sedimentation is generallyproposed as an evolution mechanism to transform flaring disks into flat disks.Theory predicts that during this process the disks preserve their gas content,however observations of group II Herbig Ae stars demonstrate a lack of gas.Aims. We map the spatial distribution of the gas and dust around the group IIHerbig Ae star HD 95881. Methods. We analyze optical photometry, Q-bandimaging, infrared spectroscopy, and K and N-band interferometric spectroscopy.We use a Monte Carlo radiative transfer code to create a model for the densityand temperature structure which quite accurately reproduces all theobservables. Results. We derive a consistent picture in which the disk consistsof a thick puffed up inner rim and an outer region which has a flaring gassurface and is relatively void of 'visible' dust grains. Conclusions. HD 95881is in a transition phase from a gas rich flaring disk to a gas poorself-shadowed disk.

HD 95881: A gas rich to gas poor transition disk?