Separate sector clocks improve the KELT-24 fit in a test of 67 TESS systems under independent Gaussian errors with fixed catalog variance ratios
We tested sector structure in 2,584 published TESS transit times from 67 systems. The null uses one constant-period clock and independent Gaussian errors, with known relative variances and one unknown scale per system. No individual sector mean offset passes Holm correction across 67 systems. A planned test with separate clocks for each sector flags only KELT-24. Its adjusted probability is 0.00615 across all 305 planned F tests. The result depends on Sector 14 and does not survive every transit deletion. Twelve fits to public Sector 14 photometry retain a negative local slope, but its size changes with flux product. This photometry has later processing and uses the same observations. It is not independent confirmation. Possible stellar pulsations were already reported. Simulations show low detection power for sector offsets in many systems. We release sector labels for 4,915 times, selection audits, fits, covariance matrices, source data, figures, and code. These results do not establish a new planet or orbital decay.
TESS · transit timing · KELT-24 · sector effects · Gaussian errors · multiple testing · public astronomical data · reproducible research
References
5- usesdoi:10.3847/1538-4365/ac545b
We use the published transit timing tables at a fixed author repository commit. Section VI.1 gives the earlier KELT-24 pulsation warning.
- Free source timing offsets remove more than 90% of period change information in 43 of 115 systems in a 2022 transit catalog sci:sha256:361975de1be4f2ad9783a0385173d9d3213b82580ddc31835761a89ca6366c39
This source offset study motivates a test of groups within the TESS source. We reuse no code or derived data.
- Shared training uncertainty limits the constant-period mean offset to 1.8 standard errors for 35 WASP-12 b TESS transits assuming fixed shapes and independent timing errors sci:sha256:9b822345ee019e5d88bd8be80f46ea9ede25948289d0c33e13191cc943a7cc04
This prediction study examines shared uncertainty and assumed sector noise in a different data set.
- usesdoi:10.3847/1538-3881/ad55ec
The selected light-curve template fixes the two TESS limb-darkening coefficients to the third model column of Table 9.
- usesdoi:10.1086/683602
We use batman for the selected photometric transit fits.
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