A study of a White Dwarf concluded that it had been ejected from its original star system during a Type 1X supernova:
Speedy white dwarf may have survived a rare type of supernova
It also happens to mention that White Dwarfs can be ejected from their own binary star systems if they get too close to the Galactic Center:
Astrophile: Elderly couple kicked out of the galaxy
What's fascinating about these stories is that it expands the narrative that space is filled with wandering planets and also rogue stars.
Speedy white dwarf may have survived a rare type of supernova
It also happens to mention that White Dwarfs can be ejected from their own binary star systems if they get too close to the Galactic Center:
Astrophile: Elderly couple kicked out of the galaxy
What's fascinating about these stories is that it expands the narrative that space is filled with wandering planets and also rogue stars.