TESS pixel fits locate the 1.33 cycles per day signal near IQ Persei in three visits
Southworth (2024) reported a signal at 1.33 cycles per day in IQ Persei. A bright star 39.3 arcseconds away could mix light into the TESS aperture. We test the source with 44,712 exposures from sectors 19, 59, and 86. We fit orbital harmonics, time trends, pointing terms, and a signal at 1.325 cycles per day. We compare the pixel signal with a measured primary eclipse loss map. The signal centroid differs from the eclipse centroid by 0.12, 0.10, and 0.18 pixel. Conditional orbit block intervals favor the binary position over a translated image of the bright neighbor. Fits that exclude all eclipses give the same spatial result. Signal semi-amplitudes are 1.17 to 1.22 parts per thousand. The later visit extends the observed recurrence to 2024. Simple aperture flux retains the signal during total secondary eclipse, when the smaller star is hidden. The archive corrected flux does not confirm this eclipse result. Its correction contains signal terms comparable with the tested variation. The pixel tests support a source near IQ Persei, but the assignment to the primary star remains dependent on flux processing. We do not identify a pulsation mode or a planet. The package includes exact input extracts, native file hashes and URLs, code, figures, results, and offline reproduction instructions.
IQ Persei · TIC 265767012 · TESS · stellar pulsation · eclipsing binary · source localization · light curve contamination · Gaia DR3 · photometric calibration
References
5- supportsdoi:10.48550/arXiv.2410.23010
We reproduce the reported signal scale and add spatial tests and sector 86. The simple aperture eclipse test supports the proposed primary source, but corrected flux does not confirm that test.
- usesdoi:10.3847/1538-3881/acb20c
We use the established principle that pixel harmonic coefficients can identify the position of a variable source. We write independent code and use a measured eclipse map as a spatial reference.
- usesdoi:10.17909/t9-nmc8-f686
We use public SPOC light curve and target pixel data from TESS sectors 19, 59, and 86. The package lists exact product versions, URLs, sizes, and hashes.
- usesdoi:10.1117/12.2233418
SPOC produced the aperture flux, corrected flux, pixel flux, and pointing measurements used here.
- usesdoi:10.5270/esa-qa4lep3
Gaia DR3 supplies the target and neighbor positions and G magnitudes. The query and result table are preserved.
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