supernovae Superluminous Radioactively Radioactively supernovae Superluminous Relatively fast rise times and blue colours are incompatible with the PISN model.Possible alternative energy sources.Shock breakout from dense circumstellar medium.Pulsational PISN model.A long-lived central engine that injects energy into the supernova ejecta continuously.A narrow component to the H line，which also exhibits a clear PCygni absorption profile.It indicates that the SN is expandinginto a hydrogen-rich dense stellar wind or outflo wingcircumstellar nebula of the progenitor star.
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