Symmetric eclipse fits show a shared 18 s departure in NY Vir TESS sector 91 from the line through sectors 23 and 50
We fit primary and secondary eclipses of NY Virginis in public TESS sectors 23, 46, 50, and 91. Each fit uses a symmetric shape, exposure integration, and a separate baseline for each eclipse. We test the 2025 sector 91 departure from a line through sectors 23 and 50. The primary departure is 18.5 ± 1.1 s. The secondary departure is 17.0 ± 3.7 s. Their shared component is 17.8 ± 1.7 s, and the secondary minus primary difference is −1.5 ± 4.2 s. Errors come from deleted time groups and include covariance between eclipse types. Alternate shapes, windows, flux products, and cadence give shared estimates from 17.5 to 18.0 s. A fit with linear drift within each sector gives 17.7 s. The result supports a shared timing change under the symmetry assumption. Earlier studies already found timing changes and failures of planet forecasts. This work adds an independent 2025 TESS reduction and a defined paired contrast. It does not establish a planet or a physical cause. The package contains the original public data, hashes, source code, numerical results, figures, and instructions to repeat the analysis.
NY Virginis · TESS · eclipse timing · close binary stars · circumbinary planets · public astronomical data · reproducible research
References
4- usesdoi:10.1093/mnras/stad2648
This prior study analysed TESS sectors 23, 46, and 50 and compared primary and secondary times. Its small eccentricity linear model supplies the reference clock used only for cycle assignment and residual display.
- doi:10.1093/mnras/staf1636
This prior study gives ground observations through June 2025 and reports failure of earlier planet forecasts. It defines the prior scope of the present measurement.
- usesdoi:10.17909/t9-nmc8-f686
Source of the original SPOC 120 s light curves for TIC 175402069 in TESS sectors 23, 46, 50, and 91. Exact products, release metadata, and hashes are preserved.
- usesdoi:10.17909/t9-st5g-3177
Source of the original SPOC 20 s light curves for TIC 175402069 in TESS sectors 46, 50, and 91, used to check cadence sensitivity. These products share photons with the 120 s products.
Cited by
5 publicationsPublic catalog entries on Sciscape.
- usesExposure averaging reduces a false timing cycle in a fixed-shape test of RR Cae's 2020 TESS data
We inspected this NY Vir study for method comparison of exposure averages and local baseline fits. The RR Cae code was written for this study. No code or data from that package are included.
- usesSymmetric fits to five TESS visits of HS 0705+6700 show no resolved common timing curvature from 2019 to 2024
We use the related paired timing contrast from the line through end visits on a different target. The present code was written independently.
- usesFits with 20 cosine terms give 82 primary eclipse times and unstable secondary times for NN Ser TESS sector 51
Adapt the MIT code for exposure-integrated symmetric fits, cached normal equations, and paired block deletion. Change the working clock and defaults for NN Ser.
- usesThe HW Vir tables in Fortier et al. (2024) do not match the printed eclipse clock
We use the concepts of symmetric exposure-integrated eclipse fits, local baselines, and paired time-group covariance. We write independent spline code and study HW Vir. We do not reproduce the earlier NY Vir result.
- usesTarget times reduce the DD CrB timing contrast by 14.45 seconds in symmetric fits to five TESS sectors
This study supplies prior examples of paired eclipse clocks and a contrast that cancels a linear clock. We implement the approach independently for DD CrB.