A fixed-shape test of 10 QLP sectors gives 114.8 effective days for 3000 ppm dips in TIC 280832588
We test whether the tentative Sector 1 dip in TIC 280832588 has an isolated repeat with the same measured shape. We use ten later public TESS QLP sectors, through Sector 97, and seven later TESS-SPOC sectors for checks. The package contains 19 original flux files. A fixed four-day quadratic fit, a split Gaussian template, time-coverage cuts, and a depth-to-error score define the primary search. The 10,467 retained QLP bins give 6072 eligible centers, or 126.5 days of eligible grid cells. No primary dimming or brightening score reaches 6; the largest dimming score is 5.536 in Sector 28. Among 10,000 isolated 3000 ppm injections, 4414 of 5095 trials with an eligible nearby fit are recovered. Integration over the full retained spans gives 114.80 effective days, with a Monte Carlo standard error of 1.35 days. A further 20,000 trials test other depths and widths. Two Sector 3 TESS-SPOC features exceed the threshold where QLP fails the time cuts. Their flux depths differ between extractions even on shared samples. QLP features in Sectors 28 and 97 exceed the threshold with some alternative baseline fits. These features remain unclassified. Exact period windows give geometric coverage at a fixed reference epoch; they are not physical period exclusions. Recovery is measured after flux extraction, and the score has no calibrated false-alarm probability. No new planet or comet is confirmed. We preserve the code, input hashes, full grids, every injection, all flags, figures, and reproduction checks.
TIC 280832588 · TESS · exocomet candidate · transit search · injection recovery · QLP · TESS-SPOC · period coverage · reproducible astronomy
References
6- usesFixed-shape fits give smaller depths in TGLC PSF flux for two of three reported TESS exocomet events sci:sha256:47f30d35b46e1aaceb78fd8e6d24325dd24d5f44738f07930516fdd8be65c148
We adopt its measured Sector 1 split Gaussian shape for TIC 280832588. We add later-sector search grids, recovery trials, and geometric period windows. We do not reuse its source code.
- usesdoi:10.1093/mnras/staf1298
This paper reports the tentative target event and discusses data through Sector 28. It defines the original scientific question and the source uncertainty.
- doi:10.15407/knit2025.06.080
This related search omits the target because of its Sector 1 quality-flag fraction. We distinguish that sample cut from a repeat test.
- usesdoi:10.17909/t9-r086-e880
The primary flux data are public QLP products from MAST. Exact input URLs and hashes are preserved.
- usesdoi:10.17909/t9-wpz1-8s54
Public TESS-SPOC flux from the same TESS images supplies the secondary extraction checks. Exact input URLs and hashes are preserved.
- doi:10.48550/arXiv.2603.22236
This release note describes the QLP extraction change from Sector 94. Our recovery trials cannot measure losses before the released flux is produced.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- From TESS Sector 94, QLP eclipse depths of 49 southern CVZ binaries are 11% smaller in the 3x3 aperture and 36% smaller in the 1x1 aperture than before, while SPOC depths do not change
Uses QLP sectors through 97. A real 3000 ppm dip appears as about 2670 ppm in S94-S97 QLP 3x3 flux. Its injection tests do not include this effect.
- usesProcessed TESS flux gives 99.2 to 112.5 effective days for 1500 ppm test dips in KIC 3542116
This prior study reports effective observing time from isolated dip injection tests for another star. We use this type of sensitivity measure with separate code, six shapes, and different score and coverage rules.