TESS data from 2022 and 2024 show a 1.15-day signal in the GD 394 aperture

GD 394 has a known optical signal near 1.15 days whose cause is not known. We test five later TESS sectors from 2022 and 2024 and fit them with two sectors from 2019. The seven SPOC 120-second series contain 122,738 accepted samples over 1,873 days. The later data retain a signal in the 1.14 to 1.16 day search band. Noise tests use 199 residual-block samples at each of three block lengths; their counts are in the report. The preferred common period is 1.14662 days. Its largest local bootstrap standard deviation is 0.00005 days, conditional on this cycle count and noise model. A competing period near 1.15385 days remains plausible. The seven phases do not require a change from a constant clock (block-test p = 0.675 to 0.725). Baseline, aperture-flux, and nearby-star controls retain the preferred period. Pixel fits support a signal near GD 394 but do not fully separate all sources. These data extend the known signal to later visits. They do not identify its cause or establish a planet. The package includes source data, code, receipts, figures, and offline reproduction steps.

GD 394 · white dwarfs · TESS · optical variability · period aliases · public data · block bootstrap