2022–2025 ZTF data exclude stable 20% triangular dips of 15, 20, or 25 days in ZTF J0139+5245 at periods of 100–112 days under the stated Gaussian noise model
We tested stable dip profiles in public ZTF DR24 data for the white dwarf ZTF J0139+5245. The test uses 209 red-band nights and 175 green-band nights from 2022 to 2025. Each profile repeats on every cycle with a fixed period from 100 to 112 days. Each dip is a triangle in magnitude with a full duration of 15, 20, or 25 days. We fit a separate normal brightness for each year. The assumed Gaussian noise has an independent term of 0.06 magnitude per night and a shared term of 0.04 magnitude per seven-day block. An analytic bound covers all periods and phases between search points. The nominal one-sided 99.865% upper limits on peak flux loss are 16.47%, 13.15%, and 11.31% in the red band. The green-band limits are 15.00%, 12.20%, and 10.54%. Stable 20% profiles are excluded within this model. We chose the late time window after data inspection. The quoted level does not adjust for that choice. The test does not exclude isolated events, missing cycles, or changes in dip shape. It does not show that all debris has gone. The package contains the exact input data, code, figures, and independent checks.
white dwarfs · ZTF J0139+5245 · planetary debris · transits · ZTF DR24 · upper limits · irregular sampling
References
3- usesdoi:10.3847/1538-4357/ab9649
This paper identifies the target and gives the original dip depths, durations, and approximate recurrence time. These facts define the tested profile family.
- usesdoi:10.1088/1538-3873/aae8ac
This paper describes the ZTF data system that produced the public photometry.
- doi:10.1093/mnras/stae750
This study gives context for long-term changes in other white dwarf debris systems.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesUnder 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 use its stated nightly and shared Gaussian error values as a sensitivity model. We test intermittent events instead of a profile on every cycle.
- Retained 2022–2025 ZTF samples of J0139+5245 have phase gaps below 3 days for fixed periods of 100–110 days
This earlier study covers continuous periods for triangular dips under a stated Gaussian noise model. Our timing bounds require no probability model for brightness errors.
- With baseline shifts within 0.03 mag, fixed 15 day, 0.25 mag dips at 104 or 107.2 days need errors over 0.10 mag on at least 20 ZTF nights in 2022–2025 at J0139+5245
This study gives continuous period limits on stable triangles under stated Gaussian errors. Our bound instead counts nights outside a fixed error bound.