Kepler-34 secondary eclipses have a mean period 4.93 seconds shorter than primary eclipses in 2009–2024 data

We test whether the secondary eclipse clock of Kepler-34 continues to advance relative to its primary eclipse clock. We fit 92 Kepler eclipses from 2009–2013 and 17 TESS eclipses from nine sectors in 2019–2024. We compare the two mission mean clocks with an estimate that cancels a common time offset within each mission. The secondary clock gains 12.68 ± 1.03 minutes over 154.15 binary cycles between these means, which are 11.73 years apart. This gives a mean secondary-minus-primary period difference of −4.93 ± 0.40 seconds per orbit. The errors use event scatter. Raw Kepler and TESS SAP flux give −4.77 ± 0.17 seconds. A block wild bootstrap gives a 0.43-second error. Individual TESS eclipse times can shift by 265 seconds between flux products. Fixed-parameter orbit calculations give −1.90 seconds for binary relativity alone and −5.25 seconds with the known planet and binary relativity. These calculations have no new fit and omit tides, spin, light travel time, and parameter errors. This work extends a known timing effect and supplies later eclipse times; it does not detect a new planet. The package includes original public inputs, source hashes, code, timing tables, figures, and reproduction instructions.

Kepler-34 · circumbinary planet · eclipse timing · Kepler · TESS · apsidal motion · public data · reproducible research