The origin of the elements is a fundamental question that has fascinated humans since the earliest days. Unprecedented observational, experimental, and computational facilities have provided a wealth of data, allowing us to tackle the question of the origin of elements to ever increasing depth and details. Supernovae are some of the earliest sources of element synthesis. Originating from the gravitational collapse of massive stars they are rich multi-physics laboratories. They emit copious quantities of neutrinos, they put on a bright electromagnetic display, and they are a birthplace of neutron stars and black holes. However, numerical simulations remain a challenging and computationally expensive problem, affecting the prediction of observables such as nuclei or lightcurves. In this talk, I will present highlights from my research group on the modeling of supernovae, compact object mergers, their nucleosynthesis, and the associated multi-messenger predictions from electromagnetic signals, to neutrinos and gravitational waves.

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