![]() BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field? Mon. A new sub-period-minimum cataclysmic variable with partial hydrogen depletion and evidence of spiral disk structure. Survey of period variations of superhumps in SU UMa-type dwarf novae. Spectroscopic and photometric periods of six ultracompact accreting binaries. Evolutionary modelling shows that ZTF J1813+4251 is destined to become a helium CV binary, reaching an orbital period under 20 minutes, rendering ZTF J1813+4251 a previously missing link between helium CV binaries and hydrogen-rich CVs. Phase-resolved spectra, multi-band light curves and the broadband spectral energy distribution allow us to obtain precise and robust constraints on the masses, radii and temperatures of both components. Here we report observations of ZTF J1813+4251, a 51-minute-orbital-period, fully eclipsing binary system consisting of a star with a temperature comparable to that of the Sun but a density 100 times greater owing to its helium-rich composition, accreting onto a white dwarf. However, no known transitional CV is expected to reach an orbital period short enough to account for most of the helium CV population, leaving the role of this evolutionary pathway unclear. These transitional CVs have been proposed as progenitors of helium CVs 13, 14, 15, 16, 17, 18. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf 10, 11, 12, 13, 14, and it is expected that these objects will transition to helium accretion. ![]() Of more than a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes 1, 2, 3, 4, 5, 6, 7, 8, 9. A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary
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