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We consider the deformation that has recently been observed in the inner partof the circumstellar disk around Beta Pictoris with the HST. Our recent groundbased adaptive optics coronographic observations confirm that the inner disk iswarped. We investigate the hypothesis that a yet undetected planet isresponsible for the observed warp, through simulations of the effect of thegravitational perturbation due to a massive companion on the disk. The physicalprocesses assumed in the simulations are discussed: since the observedparticles do not survive collisions, the apparent disk shape is driven by theunderlying collisionless parent population. The resulting possible parametersfor the planet that are consistent with the observed disk deformation arereviewed.

A planet on an inclined orbit as an explanation of the warp in the β Pictoris disc