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astro-ph.SR · Solar and Stellar Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysicsstat.AP · Applications

Symmetric fits to three TESS sectors give a secondary eclipse delay of 2.16 ± 0.59 seconds in DD CrB

We test the error in a published secondary eclipse delay for DD CrB. We use public 120-second TESS data from sectors 24, 50, and 51, with 20-second data as a dependent check. Symmetric profiles give 272 paired delays with a mean of 2.16 seconds and a one-day block sampling error of 0.59 second. A joint flux fit gives 2.54 seconds with an error of 0.58 second after time-block resampling and full profile refits. Both central values agree with the published 2.55 seconds. Neither fit gives the quoted 0.11-second error. An optimistic calculation with fixed fitted profiles, fixed backgrounds, and independent archive flux errors gives a conditional timing scale of 0.54 second. Ten model changes give combined joint delays from 2.24 to 2.62 seconds. Recovery tests support numerical accuracy within the assumed symmetric profile family. The errors do not include all possible profile asymmetry, orbit eccentricity, or shared time errors. The observations overlap earlier work and do not give a new test of a companion prediction. We preserve source files, hashes, code, figures, results, and offline rebuild instructions. The source FITS extension checksum failures remain unresolved. We do not establish a planet.

DD CrB · NSVS 07826147 · TIC 148785530 · eclipse timing · TESS · light travel time · mass ratio · uncertainty

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References

13
  1. challengesdoi:10.1093/mnras/stag290

    The central secondary eclipse delay agrees, but the two tested symmetric estimators and the conditional information calculation do not reproduce its quoted 0.11-second error. We read arXiv:2602.09925v1, section 3.1.

  2. supportsTarget times reduce the DD CrB timing contrast by 14.45 seconds in symmetric fits to five TESS sectors sci:sha256:d2044fb76a5b158fe4cf6402f1812f63fd98e326498350d4b4ab735abba5b688

    Earlier paired timing and time-convention work on this target gives consistent sector delays and reports the same unresolved SPOC extension checksum failures. We test mean-delay precision with additional information and recovery checks.

  3. doi:10.1088/2041-8205/717/2/L108

    The light travel delay can constrain a binary mass ratio under a circular orbit.

  4. doi:10.3847/1538-4357/aa6980

    Earlier work on this binary discussed the primary-secondary timing delay.

  5. doi:10.1051/0004-6361/202039851

    Earlier companion timing model for this target.

  6. doi:10.1093/mnras/staf1636

    Later observations did not follow an earlier companion prediction. We therefore distinguish a precision audit from a new planet test.

  7. usesdoi:10.17909/t9-nmc8-f686

    Public TESS 120-second SPOC light curves; exact product names and hashes are preserved.

  8. usesdoi:10.17909/t9-st5g-3177

    Public TESS 20-second SPOC light curves in sectors 50 and 51 provide a dependent cadence check.

  9. usesdoi:10.1117/12.2233418

    Description of the SPOC processing system that produced the light curves.

  10. usesdoi:10.3847/1538-4357/ac7c74

    Astropy reads the source FITS files and checks their headers.

  11. usesdoi:10.1038/s41586-020-2649-2

    NumPy provides numerical arrays and linear algebra.

  12. usesdoi:10.1038/s41592-019-0686-2

    SciPy provides spline interpolation and optimization.

  13. usesdoi:10.1109/MCSE.2007.55

    Matplotlib draws the figures.

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