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

Constant periods predict later TESS sector mean transit times of HAT-P-16 b, KELT-18 b, and WASP-20 b within two estimated standard errors

We test the three largest absolute standardized timing offsets in SCI 29d10603-efaf-4663-862d-a9387f5e0dfc. We measure 60 transit times in 12 public SPOC 120-second light curves. For each planet, we fit a symmetric transit profile and a constant period to earlier TESS sectors. We exclude the last sector from both fits. For HAT-P-16 b, the mean observed minus predicted time is -23.8 ± 26.4 seconds. For KELT-18 b, it is -2.2 ± 32.1 seconds. For WASP-20 b, it is +38.9 ± 52.6 seconds. The errors are estimated standard errors. SAP flux and trapezoid controls keep all differences below two estimated standard errors. The frozen composite catalogue misses these times by about -14, -76, and -12 minutes. For HAT-P-16 b and WASP-20 b, it pairs a newer period with a reference time fitted under a fixed discovery period. Changing only the period shifts the source-era predictions by 14.14 and 14.81 minutes. A 1.19-minute residual remains for WASP-20 b. The KELT-18 b composite period is old. A published revision predicts the last-sector times to within 0.06 minutes. The large offsets do not require a new timing signal in these data. This selected, retrospective test cannot show constant orbits at finer precision. It cannot reject decay claims from longer data sets. The package preserves raw data, hashes, event selections, code, covariance, controls, and figures.

TESS · transit timing · ephemeris · catalogue provenance · HAT-P-16 b · KELT-18 b · WASP-20 b · reproducible research

Admitted 1 citing publication

References

25
  1. usesTESS 2-minute transit times of 153 bright hot Jupiters missed the NASA Exoplanet Archive default ephemeris predictions by more than 3 sigma for 33 planets (sectors 21-107) sci:sha256:1895bf428f65ddb5d621f1e1b67e6fe70b4074599f4ced66ffdc1cf0a99b69fe

    We select its three largest absolute standardized timing offsets and reuse their frozen composite catalogue rows. We make independent measurements from 12 raw TESS light curves.

  2. usesdoi:10.3847/1538-4365/ac545b

    We use paired ephemerides to identify cycles and set local windows. We fit all event times and periods without timing priors.

  3. usesdoi:10.32023/0001-5237/70.3.2

    We test the paired revised KELT-18 b ephemeris. Its period correction predates this work.

  4. usesdoi:10.3847/1538-4365/ac9da4

    We test the paired WASP-20 b ephemeris and identify the composite period source.

  5. usesdoi:10.1093/mnras/stae854

    We test the paired HAT-P-16 b ephemeris and identify the composite period source.

  6. usesdoi:10.1002/asna.20224012

    We audit the fixed-period method and reference times in Section 3 and Tables 8 and 11. We test the effect of changing the period while retaining those times.

  7. doi:10.3847/1538-3881/ae0f19

    This longer ground and space timing study prefers orbital decay for HAT-P-16 b. Our selected TESS intervals cannot resolve that claim.

  8. usesdoi:10.1088/0004-637X/720/2/1118

    We use the discovery period for the fixed-period HAT-P-16 b reconstruction.

  9. usesdoi:10.1051/0004-6361/201423591

    We use the discovery period for the fixed-period WASP-20 b reconstruction.

  10. usesdoi:10.3847/1538-3881/aa6d5d

    We identify the original KELT-18 b composite ephemeris source. We use the exact frozen archive row, not the slightly different abstract values.

  11. usesdoi:10.1086/683602

    We use batman to calculate an exposure-integrated symmetric transit template.

  12. usesdoi:10.26133/NEA12

    We preserve the Planetary Systems source rows and reference links for the three planets.

  13. usesdoi:10.26133/NEA13

    The prior SCI work supplies the frozen composite catalogue rows that we test.

  14. usesdoi:10.17909/v4re-9874

    We use a raw public SPOC 120-second light curve from TESS sector 107. Its URI and hash are preserved.

  15. usesdoi:10.17909/msq3-je15

    We use a raw public SPOC 120-second light curve from TESS sector 84. Its URI and hash are preserved.

  16. usesdoi:10.17909/2spx-wc22

    We use a raw public SPOC 120-second light curve from TESS sector 77. Its URI and hash are preserved.

  17. usesdoi:10.17909/4asx-j298

    We use a raw public SPOC 120-second light curve from TESS sector 75. Its URI and hash are preserved.

  18. usesdoi:10.17909/7x3m-ba13

    We use a raw public SPOC 120-second light curve from TESS sector 69. Its URI and hash are preserved.

  19. usesdoi:10.17909/n9be-ep82

    We use a raw public SPOC 120-second light curve from TESS sector 57. Its URI and hash are preserved.

  20. usesdoi:10.17909/fqw7-pc41

    We use a raw public SPOC 120-second light curve from TESS sector 50. Its URI and hash are preserved.

  21. usesdoi:10.17909/xfnj-jj27

    We use a raw public SPOC 120-second light curve from TESS sector 48. Its URI and hash are preserved.

  22. usesdoi:10.17909/b1xf-5k06

    We use a raw public SPOC 120-second light curve from TESS sector 29. Its URI and hash are preserved.

  23. usesdoi:10.17909/yfks-8h45

    We use a raw public SPOC 120-second light curve from TESS sector 23. Its URI and hash are preserved.

  24. usesdoi:10.17909/yv79-8t97

    We use a raw public SPOC 120-second light curve from TESS sector 17. Its URI and hash are preserved.

  25. usesdoi:10.17909/qpsq-bk37

    We use a raw public SPOC 120-second light curve from TESS sector 2. Its URI and hash are preserved.

Cited by

1 publication

Public catalog entries on Sciscape.