Over the past decade , many rapidly evolving optical transients ( REOTs ) , whose rise and decline timescales are significantly shorter than those of canonical supernovae ( SNe ) , have been discovered and studied . Some REOTs have high peak luminosity ( \gtrsim 10 ^ { 43 } erg s ^ { -1 } ) , disfavoring the radioactivity-powered-SN model that has been widely adopted to explain normal SNe . In this paper , we study three luminous REOTs ( PS1-10bjp , PS1-11bbq , and PS1-13ess ) and use a model involving magnetar energy input to fit their bolometric light curves and temperature evolution . We find that core-collapse SNe ( CCSNe ) powered by magnetars with P _ { 0 } \approx 18 –34 ms and B _ { p } \approx ( 2.5–5.8 ) \times 10 ^ { 15 } G can reproduce their bolometric light curves as well as the temperature evolution . The inferred values of ejecta mass are \sim 0.40 –0.46 M _ { \odot } , slightly smaller than that of the Type Ic SN 1994I , indicating that they can be explained by the magnetar-powered stripped CCSN model .