TESS data from September–October 2026 show an 11.36-hour signal near ZTF J0328−1219

We test whether the known 9.937-hour signal of the debris-transiting white dwarf ZTF J0328−1219 occurs in new public TESS images. We use Sector 108 and the available part of Sector 109, downloaded on 2026 October 21. We reduce the images with local sky planes and fit trends and periodic terms together. The strongest signal in a 7–14-hour search is near 11.36 hours in both visits. The Sector 108 fit gives 11.3645 hours and a blended aperture flux semi-amplitude of 24.06 percent. The partial Sector 109 fit gives 11.3559 hours and 10.04 percent. Signed pixel maps peak within half a pixel of the white dwarf position in both camera views. The nearby red star has a much smaller signal. Aperture, trend, and native cadence tests support the measurement. Conditional residual resamples give a central 95 percent period range of 11.3570–11.3731 hours for Sector 108 with one-day blocks. Changes in signal shape and split-visit fits limit its use as an orbital error range. We recover the old 9.94-hour signal in the 2018 and 2020 visits. In 2026, conditional bounds for a coherent sinusoid at exactly 9.937 hours are 3.86 and 1.37 percent of median aperture flux. These bounds apply only to the stated signal and residual model. Prior work already reported changing 11-hour activity. This result adds a dated 2026 measurement and source location tests. TESS cannot exclude all unresolved blends. The data do not establish a new planet or an orbital change of one body. The package preserves input images, catalog data, provenance, code, numeric results, figures, and reproduction instructions.

ZTF J0328-1219 · TESS · white dwarf · planetary debris · time series · source localization · public data