Searching for Core-Collapse Supernovae in the multimessenger Era: low energy neutrinos and gravitational waves

Core-collapse supernovae are fascinating astrophysical objects still puzzling the mind of scientists. Despite the big efforts spent on developing very complex numerical simulations, the mechanism driving the final explosion of the star structure is still not completely understood. Gravitational waves are expected to carry away an imprint of this explosion mechanism, however their detections could be very challenging. Moreover, the modelling of the gravitational wave impulsive emission is also challenging because of the stochastic nature of the dynamics and the landscape of possible progenitors. Lowenergy neutrinos will be copiously emitted at the same time during the corecollapse explosion and can provide a nice trigger for the gravitational wave search. The aim of this thesis is to develop a multi-messengers approach to search for such interesting astrophysical objects by using a global network of both low-energy neutrino and gravitational wave detectors. In particular, we discuss how to improve the detection potential of the neutrino sub-network by exploiting the temporal behaviour of a neutrino burst from a core-collapse supernova. This will allow us to better disentangle low statistic signals coming from weak or far supernovae from noise. We also discuss the better strategy to combine the informations provided by neutrinos and gravitational waves and we show that the outlined procedure can give us profit as the increased significance of a neutrino burst to achieve a lower false alarm rate of a combined observation of gravitational and neutrino burst.