SK-Gd as an Observatory of Stars (Sun & Supernovæ)

Super-Kamiokande is a 50$\, \mathrm{kton}$ water Cherenkov detector located in Japan, currently the largest in the world. This makes it an ideal observatory for studying neutrinos originating from stars. Among other capabilities, it enables the observation of $^8$B solar neutrinos by analysing the effects of MSW resonances in the Sun and the Earth on their spectrum and flux, respectively. It also allows for the study of neutrinos produced during core-collapse supernovæ as well as the diffuse supernova neutrino background. The recent addition of gadolinium into the tank has enhanced these studies by improving the identification of neutron captures. The results of these analyses are summarised here.