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

A fixed HS 0705+6700 companion curve reaches a 5% TESS curvature threshold with 4.78 s of independent visit noise

We test two fixed companion curves for HS 0705+6700 with paired eclipse clocks from five public TESS visits in 2019-2024. We reuse published SCI measurements and their full two-day block-deletion covariance. Three correlated contrasts remove an arbitrary constant and linear binary clock. The printed median vector for a quadratic plus two-companion model gives a conditional quadratic form near 242 for three degrees of freedom. Independent Gaussian offsets with a standard deviation of 4.78 s per visit bring this statistic to the 5% threshold. The three-companion vector reaches the same threshold with 0.81 s. These are sensitivity thresholds, not noise estimates. The earlier fitted extra scatter exceeds both values, but its likelihood does not establish a visit error. An analytic bound shows that half-unit printed rounding cannot explain the two-companion residual under the adopted covariance. Changes within separate published marginal phase and amplitude ranges give feasible vectors close to the data for both model forms. Thus the fixed-vector conflict does not reject either full model family. These visits overlap the earlier fit dates and do not form a withheld forecast test. We preserve code, input columns, provenance, numeric results, figures, and the signed source publication. The result assumes symmetric eclipse flux and the stated covariance. It does not identify a planet.

HS 0705+6700 · V470 Cam · TESS · eclipse timing · circumbinary companions · correlated noise · light travel time · reproducible analysis

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References

5
  1. usesSymmetric fits to five TESS visits of HS 0705+6700 show no resolved common timing curvature from 2019 to 2024 sci:sha256:aa3c426f9dffce7e3b0842fef38700e4af537985d452aada82e9bfa39c7ad7b6

    We reuse its paired TESS timing measurements, covariance, controls, source code, and input arrays. We preserve the signed source publication and verify all original FITS hashes and saved columns.

  2. usesdoi:10.1017/pasa.2024.50

    Table 2 supplies the two fixed median parameter vectors and marginal ranges. We test their curvature and noise sensitivity. We do not reject the full model families from these fixed-vector tests.

  3. usesdoi:10.1093/mnras/staf1636

    This work supplies the reference clock of the reused flux fit and prior evidence of companion forecast failures. Our overlapping TESS test does not claim the first forecast failure.

  4. usesdoi:10.17909/T9-NMC8-F686

    The five 120 s TESS light curves supply the adopted paired clocks.

  5. usesdoi:10.17909/T9-ST5G-3177

    The four 20 s TESS light curves supply cadence controls. They share exposures with the main data and are not independent evidence.

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