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We investigate broad-band emission from supernova ejecta powered by arelativistic wind from a central compact object. A recent two-dimensionalhydrodynamic simulation studying the dynamical evolution of supernova ejectawith a central energy source has revealed that outermost layers of the ejectaare accelerated to mildly relativistic velocities because of the breakout of ahot bubble driven by the energy injection. The outermost layers decelerate asthey sweep a circumstellar medium surrounding the ejecta, leading to theformation of the forward and reverse shocks propagating in the circumstellarmedium and the ejecta. While the ejecta continue to release the internal energyas thermal emission from the photosphere, the energy dissipation at the forwardand reverse shock fronts gives rise to non-thermal emission. We calculate lightcurves and spectral energy distributions of thermal and non-thermal emissionfrom central engine powered supernova ejecta embedded in a steady stellar windwith typical mass loss rates for massive stars. The light curves are comparedwith currently available radio and X-ray observations of hydrogen-poorsuperluminous supernovae, as well as the two well-studied broad-lined Icsupernovae, 1998bw and 2009bb, which exhibit bright radio emission indicatingcentral engine activities. We point out that upper limits on radio luminositiesof nearby superluminous supernovae may indicate the injected energy is mainlyconverted to thermal radiation rather than creating mildly relativistic flowsowing to photon diffusion time scales comparable to the injection time scale.

Broad-band emission properties of central engine powered supernova ejecta interacting with a circumstellar medium