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astro-ph.SR · Solar and Stellar Astrophysicsastro-ph.EP · Earth and Planetary Astrophysics

TESS fits show a 75.5% fall in the Beta Pictoris F8/F11 amplitude ratio from 2020–2021 to 2025–2026

We compare two known pulsation signals of Beta Pictoris in ten public two-minute TESS light curves. We fit the known F8 and F11 signals near 47.44 and 50.49 cycles/day. Their ratio is 1.8277 in the equal-sector mean of sectors 32–34 in 2020–2021. It is 0.4472 in sector 98 in 2025–2026. The late/middle quotient is 0.2447, a 75.5% fall. Its conditional 95% interval is 0.2238–0.2652 with 0.5-day residual blocks. Fits with other trend bins, frequency lists, local frequency adjustments, and aperture flux retain the large decrease. We exclude sector 95 from the main comparison because it has an official aperture warning. Earlier work already found variable pulsations in this star. This result adds a specific later measurement. It shows a change in relative observed amplitudes under the tested fits. It does not identify intrinsic damping, exclude unresolved beating, or detect a new planet. We preserve original archive files, source checks, code, results, figures, and a separate reconstruction check.

Beta Pictoris · TESS · delta Scuti · stellar pulsations · amplitude ratio · public archive

Admitted 2 citing publications

References

6
  1. usesA fixed 500 ppm search finds 4 early dimming clusters and none later in nine TESS light curves of Beta Pictoris sci:sha256:f385b7392ad6f8a4b5d34a1939ff0d8dc73f5bf9290e8232b534fd78eb25db13

    We use ten original TESS FITS files and source records, then check each file against a fresh archive download.

  2. No tested tail fit reaches a 500 ppm loss in covered Beta Pictoris archive flux from TESS sectors 87, 95, and 98 sci:sha256:aa85ed8844b021847a2bb1abec035f1607d4157fad9f45c22b95fc6c47f5a6ce

    The source study obtained four original files from this earlier package. We retain that source record.

  3. usesdoi:10.17909/T9-NMC8-F686

    The public TESS archive supplies the original light curves.

  4. doi:10.1051/0004-6361/201834744

    This paper gives the F8 and F11 labels and reports earlier amplitude changes.

  5. usesdoi:10.1051/0004-6361/202347754

    This paper already finds changes in early TESS data. We also use its 37 published frequencies for a control fit.

  6. doi:10.1051/0004-6361/201732121

    This paper provides earlier ASTEP pulsation measurements, discussed in the checked later papers.

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