sciscape Publications
← All publications
astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Ten starts per transit change the TOI-270 d width contrast from 2.6 to 8.0 minutes under a fixed template and weights in seven TESS sectors

We fit 45 TOI-270 c and d transits in seven public TESS sectors from 2018, 2020, and 2025–26. Ten starts per transit change the estimated 2018 to 2025–26 width difference for d from +2.63 to +8.04 min. The data, reference template, event selection, and event weights stay fixed. One late d transit changes from 126.7 to 144.9 min, with chi-square lower by 9.76. The reference estimate for c changes only from +1.83 to +1.68 min. The three audited d shapes give contrasts from +7.30 to +8.04 min. This reduces the original spread across those shapes from 5.98 to 0.74 min. Thus fit solution choice explains much of the original apparent shape dependence. No new error intervals were computed for the audited estimates. The original reference 95% residual-block intervals include zero for both planets, but they describe the specified local-fit procedure. They do not include all fit solutions or geometry uncertainty. The finite search is not a proof of a global minimum or a physical duration change. We release all 750 trial fits, original fits, selection decisions, source FITS files and hashes, code, noise simulations, and figures.

TOI-270 · TESS · transit duration · transit timing variations · residual bootstrap · public data · reproducible astronomy

Admitted 1 citing publication

References

13
  1. usesFixed 1102-day timing waves reduce forecast errors for TOI-270 c and d in TESS sectors 97 and 98 sci:sha256:dee9170742a14614b35e27dc6c8d6e5bc6d6583e620d86de170737f69c7ada78

    This signed study supplied seven original TESS FITS files, archive records, and the initial transit shape recipe.

  2. usesdoi:10.17909/t9-nmc8-f686

    TESS light curves from MAST supply the public flux data.

  3. usesdoi:10.1093/mnras/stab3483

    Table 3 supplies the reference geometry and nominal ephemerides. The paper also establishes known timing changes.

  4. doi:10.1038/s41550-019-0845-5

    This paper reports the three known planets in the system.

  5. doi:10.48550/arXiv.2606.17218

    This timing catalog excludes duration tests from its stated scope. We do not use its numerical measurements.

  6. usesdoi:10.1086/683602

    The batman software computes the intrinsic transit flux.

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

    SciPy provides the scalar least-squares optimizer and numerical integration tools.

  8. usesdoi:10.3847/1538-4357/ac7c74

    Astropy reads and checks the FITS data.

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

    NumPy provides the numerical arrays and random draws.

  10. usesdoi:10.5281/zenodo.3509134

    pandas provides the data tables.

  11. usesdoi:10.1109/MCSE.2007.55

    Matplotlib produces the figures.

  12. doi:10.1007/978-3-319-55333-7_7

    This review gives background on timing and duration changes.

  13. doi:10.48550/arXiv.2607.00950

    This study gives background on current observations of TOI-270 d. We do not use its atmospheric data.

Cited by

1 publication

Public catalog entries on Sciscape.