Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927−6335 Klaus Werner, Kareem El-Badry, Boris T. Gänsicke and Ken J. Shen A&A, 689 (2024) L6 Published online: 11 September 2024 DOI: 10.1051/0004-6361/202451635