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astro-ph.EP · Earth and Planetary Astrophysics

Public Kepler-411 b durations do not show the fixed 4:5 model drift at 0.87 solar mass and 0.82 solar radius

We test the transit duration changes of the three fixed Kepler-411 models in Table 7 of Lammers and Winn (2026), arXiv:2604.16297v2. We use public duration estimates from Holczer et al. (2016), a stellar mass of 0.87 solar mass, and a stellar radius of 0.82 solar radius. The main sample has 307 planet b events without source outlier or overlap flags. Exact Newtonian contact times predict a drift of -31.18 minutes per 1300 days for the fixed 4:5 model. The catalog drift is -0.83 +/- 2.37 minutes per 1300 days. This error is a formal regression error after a correction for residual scatter. A pairs bootstrap with 90 day bins gives a drift standard deviation of 3.01 minutes per 1300 days. After one free constant offset, the fixed 4:5 curve has duration chi-square 602.85, compared with 394.00 for a constant duration. The fixed 1:2 and 6:1 drifts are -0.77 and -9.67 minutes per 1300 days. A separate 0.2 degree rigid rotation of the 6:1 system permits all reported transits, but retains a large duration mismatch for planet d. TTVFast and a separate IAS15 integration agree within 0.00242 second for 2036 conjunctions. We release source extracts, provenance, code, figures, all event results, and checks. Catalog templates and stellar activity can bias durations. We do not refit raw flux or calibrate those biases. The result tests displayed point orbits under the stated assumptions. It does not reject full resonance families or identify a new planet.

Kepler-411 · transit duration · transit timing · orbital dynamics · public data · reproducibility

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References

7
  1. usesThe published 6:1 Kepler-411 orbit cannot produce 11 of 17 Kepler transits at the adopted stellar mass and radius sci:sha256:4eb5b82caa3f336deb6810c29ac87d7ec9485a272c12c42815f0b23ceddd93dc

    We adapt its canonical Jacobi conversion, timing parser, and Table 7 parser under the MIT license. We extend its fixed orbit geometry test with public duration estimates and a rigid viewing rotation.

  2. challengesdoi:10.48550/arXiv.2604.16297

    We test the displayed Kepler-411 models in Table 7 of version 2. The fixed 4:5 model predicts a large b duration decrease that the selected public catalog estimates do not show at the adopted stellar inputs. This test does not reject the full 4:5 family.

  3. usesdoi:10.3847/0067-0049/225/1/9

    We use the public common durations, individual fractional duration changes, errors, and flags for 509 Kepler-411 events. We do not claim new duration measurements.

  4. usesdoi:10.1051/0004-6361/201834275

    We use all 462 source transit times and the adopted stellar and radius inputs. This source already reports no clear duration change for planet d.

  5. usesdoi:10.1088/0004-637X/787/2/132

    TTVFast supplies conjunction times and projected geometry at three integration step sizes.

  6. usesdoi:10.1051/0004-6361/201118085

    REBOUND supplies a separate numerical orbit calculation.

  7. usesdoi:10.1093/mnras/stu2164

    IAS15 supplies conjunction and contact roots for the main duration calculation and numerical checks.

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