Recent observations and statistical studies have revealed that a significant
fraction of hydrogen-poor superluminous supernovae (SLSNe-I) exhibit light
curves that deviate from the smooth evolution predicted by the magnetar-powered
model, instead showing one or more bumps after the primary peak. Cependant, the
formation mechanisms of these post-peak bumps remain a matter of debate.
Furthermore, previous studies employing the magnetar-powered model have
typically assumed a fixed magnetic inclination angle and neglected the effects
of magnetar precession. Cependant, recent research has shown that the precession
of newborn magnetars forming during the collapse of massive stars causes the
magnetic inclination angle to evolve over time, thereby influencing magnetic
dipole radiation. In this paper, therefore, we incorporate the effects of
magnetar precession into the magnetar-powered model to develop the precessing
magnetar-powered model. Using this model, we successfully reproduce the
multi-band light curves of 6 selected representative SLSNe-I with post-peak
bumps. Moreover, the derived model parameters fall within the typical parameter
range for SLSNe-I. By combining the precessing magnetars in SLSNe-I and long
GRBs, we find that the ellipticity of magnetars is related to the dipole
magnetic field strength, which may suggest a common origin for the two
phenomena. Our work provides a potential explanation for the origin of
post-peak bumps in SLSNe-I and offers evidence for the early precession of
newborn magnetars formed in supernova explosions.

Cet article explore les excursions dans le temps et leurs implications.

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