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astro-ph.SR · Solar and Stellar Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

The measured B eclipse phase of Y Cyg decreases as its B to A half-depth width ratio increases in five TESS sectors from 2019 to 2024

We test eclipse timing and width changes in Y Cyg with five original 120-second SPOC light curves from TESS sectors 15, 41, 55, 75, and 82. There are 21 complete groups, each with one B eclipse between adjacent A eclipses. Matched half-depth crossings give a mean B phase decrease from 0.5816077 in 2019 to 0.5381624 in 2024. At a fixed period scale of 2.99633179 days, this is a decrease of 187.45 minutes. The B to A width ratio increases by 13.94%. All 34 tested measurement definitions give both signs. Their interval decreases range from 187.21 to 190.32 minutes. A finite-inclination Kepler model with uniform stellar discs uses the historical apsidal rate. Its angle and width scale are anchored to 2019 only. It predicts a decrease of 186.44 minutes and a width-ratio increase of 15.00%. These results support the established apsidal-motion picture. The 1.01-minute timing residual is smaller than tested processing effects. It does not establish a new physical rate or another body. Timing and width use the same crossings and are correlated. The package preserves source FITS files, hashes, event measurements, rejected windows, synthetic controls, figures, and offline reproduction code.

Y Cyg · TESS · eclipsing binary · apsidal motion · eclipse timing · eclipse width · public astronomical data · reproducible analysis

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References

4
  1. usesdoi:10.1051/0004-6361/201323230

    Table 8 solution P3 supplies the fixed orbit, radii, apsidal rate, and marginal parameter errors for the conditional prediction.

  2. usesdoi:10.1051/0004-6361/202141484

    The Y Cyg discussion supplies the prior TESS timing context. Table 2 supplies four matched 2019 intervals for the external audit.

  3. usesdoi:10.17909/t9-nmc8-f686

    The five original SPOC light curves are source observations from this TESS collection. Product URLs, retrieval times, sizes, and SHA-256 hashes fix the exact versions.

  4. usesThe measured secondary eclipse phase of GG Lup increased in four TESS sectors from 2019 to 2026 sci:sha256:0f878a304f9ab68a4649c5060bc92ccc9ce5a176d741c6240fd71870e71cd2f8

    The local phase between adjacent A eclipses and the matched-depth midpoint method informed this study. The present code is a separate implementation. No source data or code were copied.

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