Faint calcium-rich transient from a double-detonation of a 0.6 M⊙ carbon-oxygen white dwarf star: Complimentary material

Complimentary material to the manuscript. The videos show the hydrodynamical evolution of the merger leading to the double-detonation. The movie "overdensity_formation.mp4" shows slices through the orbital plane color coded with the density (left) and the temperature (right), displaying frame by frame the formation of a cold, overdense fluid parcel after the disruption of the HeWD. The remaining movies show the overall evolution of different quantities with slices through the orbital plane on the left and perpendicular to the orbital plane on the right.