Five DS Tuc aperture events exceed 20 s of measured equivalent duration in five TESS sectors from 2025–2026

A fixed search of ten TESS SPOC light curves at 120 s cadence gives five positive DS Tuc aperture events with measured equivalent duration (ED) of at least 20 s in five sectors from 2025–2026. The live time is 86.100 days. Three events pass the same cut in 45.122 live days from 2018–2020. The late-to-early rate ratio is 0.87, with an exact 95% conditional Poisson interval of 0.17–5.62 and a two-sided probability of 1.00 under equal rates. This wide interval does not resolve a rate change. The separate 2023 group has no selected event in 34.110 live days. A 15,000-trial recovery test selects 20 s as the lowest tested size with at least 90% observed detection in every sector and each of three exponential decay models. All 3,000 trials at 20 s are detected. However, only 0–42% per cell pass the measured 20 s cut. A separate 3,000-trial control with exact nominal 120 s exposure averages gives 99–100% detection and 0–39% selection. The rate therefore describes a measured class in processed aperture data. It does not describe a complete physical flare population. All eight selected pulses appear in both corrected and simple aperture flux. TESS does not resolve the two stars, so the source star remains unknown. The package contains the original FITS files, hashes, code, event tables, every recovery trial, figures, and offline reproduction instructions.

DS Tuc · TESS · stellar flares · equivalent duration · injection recovery · unresolved binary · public astronomical data · exoplanet hosts