The recently observed excess of electron recoil events in XENON1T can be interpreted as the absorption of bosonic dark matter particles in the keV range such as axion-like particles or dark photons. These same particles can also be produced in astrophysical systems such as horizontal branch stars or white dwarfs and account for the anomalous cooling rates observed in these systems. This talk considers the possibility that these phenomena have a common origin and discusses whether such an interpretation is preferred over the background hypothesis from a statistical point of view.