We present our study of OGLE-2014-SN-073 , one of the brightest Type II SN ever discovered , with an unusually broad lightcurve combined with high ejecta velocities .
From our hydrodynamical modelling we infer a remarkable ejecta mass of \mathbf { 60 ^ { +42 } _ { -16 } } M _ { \odot } , and a relatively high explosion energy of \mathbf { 12.4 ^ { +13.0 } _ { -5.9 } \times 10 ^ { 51 } } erg .
We show that this object belongs , with a very small number of other hydrogen-rich SNe , to an energy regime that is not explained by standard core-collapse ( CC ) neutrino-driven explosions .
We compare the quantities inferred by the hydrodynamical modelling with the expectations of various exploding scenarios , trying to explain the high energy and luminosity released .
We find some qualitative similarities with pair-instabilities SNe , although a prompt injection of energy by a magnetar seems also a viable alternative to explain such extreme event .