In this paper , we investigate the energy-source models for the most luminous supernova ASASSN-15lh .
We revisit the ejecta-circumstellar medium ( CSM ) interaction ( CSI ) model and the CSI plus magnetar spin-down with full gamma-ray/X-ray trapping which were adopted by [ Chatzopoulos et al .
( 2016 ) Chatzopoulos , Wheeler , Vinko , Nagy , Wiggins , & Even ] and find that the two models can not fit the bolometric LC of ASASSN-15lh .
Therefore , we consider a CSI plus magnetar model with the gamma-rays/X-rays leakage effect to eliminate the late-time excess of the theoretical LC .
We find that this revised model can reproduce the bolometric LC of ASASSN-15lh .
Moreover , we construct a new hybrid model ( i.e. , the CSI plus fallback model ) , and find that it can also reproduce the bolometric LC of ASASSN-15lh .
Assuming that the conversion efficiency ( \eta ) of fallback accretion to the outflow is typically \sim 10 ^ { -3 } , we derive that the total mass accreted is \sim 3.9 ~ { } M _ { \odot } .
The inferred CSM mass in the two models is rather large , indicating that the progenitor could have experienced an eruption of hydrogen-poor materials followed by an energetic core-collapse explosion leaving behind a magnetar or a black hole .