TESS data show that the eclipse gap in V541 Cyg increased from 2021 to 2024
We measured eclipse times in V541 Cyg to test its known orbital advance with later TESS data. Seven public 120-second SPOC light curves from 2019–2024 give 17 accepted eclipse centers: ten primary and seven secondary. The secondary times span 2021–2024. Independent even spline profiles and separate linear eclipse clocks give a gap increase of 64.83 ± 1.08 seconds per year. The error is one standard deviation, conditional on the timing and clock models. The trend persists with corrected flux, free sector time shifts, a common quadratic clock, Kepler eclipse profiles, and removal of each sector. For fixed eccentricity 0.4684 and inclination 89.832 degrees, the inferred orbital advance is 0.844 ± 0.014 degrees per century. This agrees with the published total prediction from relativity, stellar tides, and rotation. The result adds later times and reproducible checks of a known effect. It does not establish a new companion. The package contains the original FITS files, hashes, source records, code, timing tables, figures, numerical checks, and offline instructions.
V541 Cyg · TIC 71531463 · TESS · eclipsing binaries · apsidal motion · eclipse timing · public data · reproducibility
References
7- usesdoi:10.17909/t9-nmc8-f686
The seven original TESS SPOC light curves supply all flux measurements. Exact versions are fixed by bundled hashes.
- usesdoi:10.3847/1538-4357/836/2/177
The published eccentricity, inclination, and fractional radii define the geometric controls and conditional orbital conversion.
- supportsdoi:10.1051/0004-6361/202040004
The later TESS trend agrees with the published total orbital-advance prediction. One 2019 primary event overlaps its input data.
- usesdoi:10.26093/cds/vizier.36490064
The published sector-14 eclipse times set the event-search epoch and supply a method comparison.
- usesdoi:10.1086/683602
The batman quadratic occultation kernel supplies the physical profile and synthetic-data controls.
- doi:10.1093/mnras/stag515
This recent companion search gives context for tests of timing bias and expected stellar orbital advance.
- usesSAP and PDCSAP both show an increasing scaled eclipse interval in V1143 Cyg from 2019 to 2024 sci:sha256:576b1e87fc29bbb248df95cee59dc840a86575b48a10433eba77581e17f13980
This V1143 Cyg study informed the choice of flux, profile, geometry, and sampling checks. No code or numerical measurements were reused.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- usesFree intensity fits at fixed stellar geometry do not separate two orbit models in 17 TESS eclipses of V541 Cyg
We use its seven input light curves, event selection, initial centers, and three MIT source modules. We add width errors and a joint test of two orbit causes.
- usesTESS noise from 2019 to 2024 gives 67.98% clock coverage at one standard error for 17 fixed V541 Cyg profiles
The unchanged eclipse-time estimator, event selection, and four-term clock are reused. We reproduce its 17 times and observed gap slope, then add a noisy coverage benchmark.