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We perform one-dimensional radiation-hydrodynamic simulations of energeticsupernova ejecta colliding with a massive circumstellar medium (CSM) aiming atexplaining SN 2016aps, likely the brightest supernova observed to date. SN2016aps was a superluminous Type-IIn SN, which released as much as $\gtrsim5\times 10^{51}$ erg of thermal radiation. Our results suggest that themulti-band light curve of SN 2016aps is well explained by the collision of a$30\ M_\odot$ SN ejecta with the explosion energy of $10^{52}$ erg and a$\simeq 8\ M_\odot$ wind-like CSM with the outer radius of $10^{16}$ cm, i.e.,a hypernova explosion embedded in a massive CSM. This finding indicates thatvery massive stars with initial masses larger than $40\ M_\odot$, whichsupposedly produce highly energetic SNe, occasionally eject their hydrogen-richenvelopes shortly before the core-collapse. We suggest that the pulsationalpair-instability SNe may provide a natural explanation for the massive CSM andthe energetic explosion. We also provide the relations between the peakluminosity, the radiated energy, and the rise time for interacting SNe with thekinetic energy of $10^{52}$ erg, which can be used for interpreting SN2016aps-like objects in future surveys.

Extremely energetic supernova explosions embedded in a massive circumstellar medium: the case of SN 2016aps