What type of astronomical system is eRASSU J0608?

A team led by Indian researchers studied an ultracompact double-white-dwarf binary named eRASSU J0608, which has an orbital period of approximately 6.24 minutes and exhibits X-ray emission due to direct-impact accretion. Its orbital period is decreasing due to gravitational radiation, and this system—with a chirp mass of approximately 0.43 solar masses—could become a potential verification source for the future LISA mission.