  As dense and hot bodies with a well-understood equation of state, white
dwarfs offer a unique opportunity to investigate new physics. In this paper, we
examine the role of dark sectors, which are extensions of the Standard Model of
particle physics that are not directly observable, in the cooling process of
white dwarfs. Specifically, we examine the role of a dark photon, within the
framework of a three-portal Model, in enhancing the neutrino emission during
the cooling process of white dwarfs. We compare this scenario to the energy
release predicted by the Standard Model. By analyzing the parameter space of
dark sectors, our study aims to identify regions that could lead to significant
deviations from the expected energy release of white dwarfs.
