Under stated Gaussian errors, 2022–2025 ZTF data limit 25-day triangular eclipses with at least 45% peak loss to 7 of 12 tested J0139+5245 cycles

We test how many deep dust eclipses could remain in a late ZTF record if some cycles are quiet. We use public ZTF DR24 r-band detections for the white dwarf ZTF J0139+5245. We test the first 12 model centres on or after 1 January 2022. The period can be any value from 100 to 110 days, and the phase is unknown. A local triangle fit gives an upper limit for each event centre. A union bound covers the true events. A separate interval calculation covers periods between search points. Under independent Gaussian nightly errors of 0.06 mag plus shared seven-day errors of 0.04 mag, at most 7 of the 12 cycles can contain a 25-day eclipse with at least 45% peak flux loss, at nominal 95% confidence. The bounds for 15- and 20-day eclipses are both 9. These three bounds persist in the tested larger-error and fit-window checks. The result permits intermittent events that a stable-repeat test does not describe. It requires the stated error law, a locally constant baseline, fixed period and phase, and the tested triangle shape. It treats catalog times and the previously selected late window as fixed. It does not measure an event rate or show that debris is absent. The package preserves the frozen input, prior-work records, code, numerical checks, figures, and reproduction steps.

white dwarf · planetary debris · ZTF J0139+5245 · intermittent eclipses · ZTF DR24 · event count · confidence bound · seasonal gaps