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

Symmetric eclipse fits show 8 seconds of drift from a fixed V471 Tauri timing model in 2021 TESS data

V471 Tauri is an eclipsing white dwarf binary. We test whether a constant time offset makes a fixed published timing model follow its 2021 TESS eclipse centres. We fit 110 eclipses in 20 second SPOC data from sectors 42, 43, and 44. A symmetric eclipse profile is integrated over each exposure. Each eclipse has its own flux baseline and depth. The measured shift decreases by 4.36 seconds over 52.59 days. The fixed values from Table 4 of Kundra et al. (2022) predict an increase of 3.97 seconds. The difference changes by -8.33 seconds, with a conditional fit error of 1.01 seconds. Seven choices of baseline, window, flux, and eclipse shape give changes from -9.27 to -7.83 seconds. Five 120 second sector fits extend the data product to 2023. The overlapping exposure products are correlated. Model parameter errors, unknown clock errors, and changing eclipse asymmetry are not included in the fit error. The result measures apparent eclipse-centre drift under the stated fits. It does not identify a physical cause or establish a planet. The package preserves eight original FITS files, source records, code, tables, figures, and reproduction instructions.

V471 Tauri · TESS · eclipse timing · white dwarf binaries · light travel time · reproducible astronomy

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References

7
  1. usesdoi:10.1093/mnras/stac2812

    Table 4 gives the fixed timing model. Table 3 gives published times for a context check. The source already reports extra timing variation.

  2. usesdoi:10.1117/12.2233418

    The study uses public light curves from the TESS Science Processing Operations Center.

  3. usesdoi:10.1117/1.JATIS.1.1.014003

    The TESS mission supplied the public observations.

  4. doi:10.1016/j.newast.2025.102513

    Prior work studies activity and eclipse depths in K2 and TESS data for this star. Only the public abstract and indexed publisher text were available.

  5. doi:10.1093/mnras/stac721

    Prior magnetic field work gives context for activity and the limits of photometric timing.

  6. doi:10.1093/mnras/stad2794

    Prior work gives astrometric and imaging context for companion claims in V471 Tauri.

  7. doi:10.3847/1538-3881/ab93dd

    Prior work checks early TESS timing. It does not calibrate the sectors used here.

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