Helium as a signature of the double detonation in Type Ia supernovae. - Collins, Christine E; Sim, Stuart A; Shingles, Luke J; Gronow, Sabrina; Röpke, Friedrich K; Pakmor, Rüdiger; Seitenzahl, Ivo R; Kromer, Markus (Monthly Notices of the Royal Astronomical Society, 2023)