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The recently discovered vast thin plane of dwarf satellites orbiting theAndromeda Galaxy (M31) adds to the mystery of the small scale distribution ofthe Local Group's galaxy population. Such well defined planar structures areapparently rare occurrences in cold dark matter cosmological simulations, andwe lack a coherent explanation of their formation and existence. In this paper,we explore the long-term survivability of thin planes of dwarfs in galactichalos, focusing, in particular, on systems mimicking the observed Andromedadistribution. The key results show that, in general, planes of dwarf galaxiesare fragile, sensitive to the shape of the dark matter halo and otherperturbing effects. In fact, long lived planes of satellites only exist inpolar orbits in spherical dark matter halos, presenting a challenge to theobserved Andromeda plane which is significantly tilted with respect to theoptical disk. Our conclusion is that, in standard cosmological models, planesof satellites are generally short lived, and hence we must be located at arelatively special time in the evolution of the Andromeda Plane, lucky enoughto see its coherent pattern.

On the Stability of Satellite Planes I: Effects of Mass, Velocity, Halo Shape and Alignment