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astro-ph.SR · Solar and Stellar Astrophysics

A 35-frequency fit gives a lower F3/F1 amplitude ratio for HD 139614 in TESS sector 103 than in sector 12

We test whether two strong pulsations in HD 139614 kept the same relative strength. We use all four public 120-second TESS SPOC light curves in sectors 12, 38, 65, and 103. We fit 35 published frequencies and slow trends in each visit. The F3/F1 amplitude ratio is 1.3612 in 2019 and 0.9418 in 2026. The difference is -0.4194, with a conditional 95% interval from -0.4526 to -0.3862. This is a 30.8% fall relative to the 2019 value. The result remains in tests with raw aperture flux, other trend models, other error group lengths, and nearby residual peaks. A common flux scale cannot explain a ratio change. Unresolved beating, variable contamination, and frequency-dependent calibration remain possible causes. The intervals assume independent time groups and the fitted signal model. We do not detect a planet or determine the cause of the change. The package includes the original light curves, source hashes, fit results, figures, code, and a plan saved before flux access.

HD 139614 · TIC 254387071 · TESS · delta Scuti · pulsation amplitude · time series · public data · reproducible research

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References

7
  1. usesdoi:10.1093/mnras/stab144

    Table 2 supplies the 35 frequencies, mode labels, and amplitude threshold for the eight free frequencies.

  2. usesdoi:10.17909/t9-nmc8-f686

    The four preserved 120-second SPOC light curves come from this MAST collection. Exact product names and hashes fix the data version.

  3. doi:10.1117/1.JATIS.1.1.014003

    This paper describes the TESS mission.

  4. doi:10.1117/12.2233418

    This paper describes the SPOC data pipeline.

  5. doi:10.1093/mnras/stw1153

    This study shows that beating and other causes can change measured delta Scuti amplitudes.

  6. doi:10.1051/0004-6361/201936509

    This disk study gives context for the target.

  7. doi:10.48550/arXiv.2610.06332

    This recent disk study gives context. The pulsation test does not test its planet model.

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