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Nascent neutron stars with millisecond periods and magnetic fields in excessof $10^{16}$ Gauss can drive highly energetic and asymmetric explosions knownas magnetar-powered supernovae. These exotic explosions are one theoreticalinterpretation for supernovae Ic-BL which are sometimes associated with longgamma-ray bursts. Twisted magnetic field lines extract the rotational energy ofthe neutron star and release it as a disk wind or a jet with energies greaterthan 10$^{52}$ erg over $\sim 20$ sec. What fractions of the energy of thecentral engine go into the wind and the jet remain unclear. We have performedtwo-dimensional hydrodynamical simulations of magnetar-powered supernovae (SNe)driven by disk winds and jets with the CASTRO code to investigate the effect ofthe central engine on nucleosynthetic yields, mixing, and light curves. We findthat these explosions synthesize less than 0.05 Msun of Ni and that this massis not very sensitive to central engine type. The morphology of the explosioncan provide a powerful diagnostic of the properties of the central engine. Inthe absence of a circumstellar medium these events are not very luminous, withpeak bolometric magnitudes $M_b \sim -16.5 $ due to low Ni production.

Magnetar-Powered Supernovae in Two Dimensions. II. Broad-Line Supernovae Ic