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

TESS sector 91 SAP flux shows a 44% dip at EPIC 204278916 with a local linear reference

We measure one large dip at EPIC 204278916 in public 120-second TESS sector 91 data from 2025. With a local linear reference and 30-minute means, the SAP depth is 43.6%. The width at half depth is 16.9 hours. The minimum bin is at BTJD 3778.155569. Four two-sided reference choices and three bin lengths give depths of 43.1% to 43.8% and widths of 16.6 to 16.9 hours. These are method ranges, not confidence intervals. PDC and new pixel sums retain the event. The lost-light center is 0.026 pixel from the target WCS position. Its offset stays below 0.063 pixel across 12 image tests. Four catalog neighbors within 10 arcseconds can supply only a 0.474% decrease if their listed magnitudes and catalog completeness hold. These checks support association with the target, but cannot exclude an unknown unresolved source or every common calibration error. Dips were already known from 2014, and later spectra were already public. This work adds a measured 2025 event. Its physical cause remains open. No period or planet is established. The package contains original inputs, source hashes, code, tables, figures, two independent primary calculations, and an offline reproduction check.

EPIC 204278916 · TIC 9735122 · TESS · K2 · young stars · dimming · difference images · source localization · reproducibility

Admitted 1 citing publication

References

5
  1. doi:10.1093/mnras/stw2155

    This paper reports the 2014 dips and the disk evidence for the target. We add a measured 2025 event and image checks.

  2. doi:10.1051/0004-6361/202556661

    This later dipper study includes spectra of the target from 2018 and 2019. Activity after 2014 was already studied.

  3. doi:10.1117/12.2233418

    This paper describes the TESS processing pipeline. We use standard public SPOC light-curve and target-pixel products.

  4. doi:10.3847/1538-3881/ab3467

    This paper describes the TESS Input Catalog. A frozen catalog response supplies the field source positions and T magnitudes.

  5. QLP detrended flux gives smaller signed dip areas in four tested RZ Psc intervals in TESS Sector 57 sci:sha256:8e563c1ef9159b925d36d3bf42cf76f032ca5a13bf6834e7d9c4ca86e2299385

    This study gives context for archive flux-column checks in a different dimming star and pipeline. We use none of its code or data.

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