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

A complete TESS sector 100 transit extends the 2019–2023 TOI-1227 b timing record to 2026

We measured the complete TOI-1227 b transit in the public TESS sector 100 two-minute light curve. The time at epoch 90 is 2461080.039982 BJD TDB. Its central 68% interval extends 6.9 minutes before and 7.1 minutes after this value. The model fixes the transit shape and fits a local baseline and correlated noise. The time is 17.1 minutes later than the sine curve printed in 2024. Seventeen alternate polynomial and shape fits give offsets from 16.4 to 20.0 minutes. A separate fit to the older times gives a broad 2026 forecast when extra timing scatter is allowed. The new time is consistent with that conditional forecast. A 5.20-hour gap covers the expected sector 99 transit centre, so we do not report its fitted time as a measurement. The package preserves seven native light curves, source records, code, posterior samples, figures, and repeat instructions. This result extends one published timing table. It does not identify a second planet or measure a new dynamical effect.

TOI-1227 b · transit timing · TESS · young planets · public data · correlated noise · data gaps

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References

15
  1. usesdoi:10.1051/0004-6361/202348492

    We use the Table 2 times and transit shape, and compare the Table 3 sine clock.

  2. doi:10.48550/arXiv.2512.06035

    This survey lists the five older TESS sectors for TOI-1227.

  3. A positive flux mask leaves a timing error of 41 minutes in 107 later DS Tuc tests with fixed covariance sci:sha256:a2d38af836b2318bcbdf23b54a069d8e5b8bf0847eb585fa14b2c56945099faf

    This prior timing test on a different young star provides context for the stated limits on activity and timing error. It does not calibrate this result.

  4. doi:10.1051/0004-6361/201321309

    Spot simulations show that stellar surface structure can change fitted transit times. We do not transfer a numerical error bound to TOI-1227.

  5. usesdoi:10.17909/zmqh-9k13

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 11.

  6. usesdoi:10.17909/rcrk-wq46

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 12.

  7. usesdoi:10.17909/8sdh-wc61

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 38.

  8. usesdoi:10.17909/154x-7971

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 64.

  9. usesdoi:10.17909/wnqt-qz49

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 65.

  10. usesdoi:10.17909/bptp-t156

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 99.

  11. usesdoi:10.17909/0jzb-y666

    We preserve and analyze the native two-minute SPOC light curve for TIC 360156606 in TESS sector 100.

  12. usesdoi:10.1086/683602

    We use batman to calculate the exposure-integrated transit.

  13. usesdoi:10.3847/1538-3881/aa9332

    We use the celerite Gaussian-process method.

  14. usesdoi:10.3847/2515-5172/aaaf6c

    We use the celerite2 implementation.

  15. usesdoi:10.1086/670067

    We use emcee to sample the transit-time posterior.

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