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

TESS and ZTF reject 24.83% of 66–1100 day periods for a fixed 0.12 day eclipse core of at least 20% in V928 Tau

We tested constant repeats of the 2017 K2 eclipse in V928 Tau (EPIC 247795097, TIC 268324580). We used five TESS-SPOC light curves from 2021, 2023, and 2026. We also used public ZTF release 24 data from 2018–2025. The model requires a 0.12 day core in each survey band. The observed flux loss must be at least 20% throughout each core. The reference time can change by 0.015 days in either direction. A rejection needs two bright, nonoverlapping exposure envelopes in the same survey and cycle. Both must be fully inside the core for every allowed reference offset. We use flux bounds at five times the formal error. We allow the unobscured baseline to be 5% above the median. Both TESS aperture and corrected flux must pass. Exact interval unions reject 256.7049 days of period length from 66 to 1100 days, or 24.8264%. TESS alone rejects 21.3532%. The printed 201.200 and 343.766 day values from the 2020 study fall within rejected intervals. These results depend on the fixed core and calibration conditions. The fractions measure interval length. They do not give orbit probabilities. We also report a candidate dimming on 2019-11-27. Two r exposures and one g exposure show about 23% loss. Nearby comparison stars stay bright, and image aperture measurements support the low catalog flux. The cause, duration, and relation to the 2017 eclipse remain unknown. The package contains source bytes, hashes, code, figures, exact intervals, exposure witnesses, and independent checks. This study does not identify a planet.

V928 Tau · EPIC 247795097 · TIC 268324580 · stellar occultation · TESS · K2 · ZTF DR24 · period constraints · candidate dimming · public astronomical data

Admitted 2 citing publications

References

14
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    This study found and modeled the 2017 eclipse in V928 Tau. We use its corrected blended photometry and test six printed period values.

  2. usesK2, ZTF, and TESS exclude 27.43% of 70–1200 day periods for fixed 0.25 day dips of at least 40% in EPIC 204376071 sci:sha256:f06a17ee1c7c142b6deca59bdbd05dc45593fd0104ea165ff5948b291dcfbfd2

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    We use EVEREST Campaign 13 photometry to check the historical eclipse.

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