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We conduct three-dimensional hydrodynamical simulations of two opposite jetsthat interact with a spherical slow wind that includes a denser shell embeddedwithin it, and obtain a bipolar nebula where each of the two lobes is composedof two connected bubbles and Rayleigh-Taylor instability tongues that protrudefrom the outer bubble and form the `columns crown'. The jets are launched for ashort time of 17 years and inflate a bipolar nebula inside a slow wind. Whenthe bipolar structure encounters the dense shell, the interaction causes eachof the two lobes to split to two connected bubbles. The interaction is prone toRayleigh-Taylor instabilities that form tongues that protrude as columns fromthe outer bubble. The bases of the columns form a ring on the surface of theouter bubble, and the structure resemble a crown that we term the columnscrown. This structure resembles, but is not identical to, the many filamentsthat protrude from the lobes of the bipolar planetary nebula Menzel~3. Wediscuss our results in comparison to the structure of Menzel~3 and the ways bywhich the discrepancies can be reconciled, and possibly turn our failure toreproduce the exact structure of Menzel~3 to a success with jets-shellinteraction simulations that include more ingredients.

The formation of `columns crowns' by jets interacting with a circumstellar dense shell