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Recent theoretical work has implicated fast bar formation modes andsubsequent evolution as the creation mechanism for the observed peanut-shapedbulges in some edge-on disk galaxies. We demonstrate an N-body simulation of adisk undergoing a contrasting slow mode of bar growth, unsubjected to abuckling instability, which nonetheless grows the 4:1 orbit family responsiblefor a peanut-shaped bulge. We also present a simulation with fast mode bargrowth, which exhibits thickening similar to other work. A novel orbitclassification method that finds dynamically distinct families is presented,allowing for a detailed analysis of angular momentum transfer channels withinthe disk.

Creation of Peanut-Shaped Bulges via the Slow Mode of Bar Growth