  We consider the deformation that has recently been observed in the inner part
of the circumstellar disk around Beta Pictoris with the HST. Our recent ground
based adaptive optics coronographic observations confirm that the inner disk is
warped. We investigate the hypothesis that a yet undetected planet is
responsible for the observed warp, through simulations of the effect of the
gravitational perturbation due to a massive companion on the disk. The physical
processes assumed in the simulations are discussed: since the observed
particles do not survive collisions, the apparent disk shape is driven by the
underlying collisionless parent population. The resulting possible parameters
for the planet that are consistent with the observed disk deformation are
reviewed.
