TESS data show that the secondary eclipse delay in PT Vel increased by 23 minutes from 2019 to 2025
PT Vel is an eccentric eclipsing binary with known apsidal motion. This study measures its primary-to-secondary eclipse spacing with a common method in six TESS QLP sectors from 2019 to 2025. Symmetric profiles fit 123 eclipse centers. Each event has a free center, depth, and local background. Exposure integration and separate primary and secondary clocks are included. The delay beyond half an orbit increases from 152.48 to 175.74 minutes. The increase is 23.26 minutes. Six paired choices of background, time window, and flux correction give increases from 23.21 to 23.29 minutes. These ranges are method checks, not confidence intervals. The fitted primary and secondary widths change in opposite directions. The results support continued apsidal motion. Sector 89 adds 28 eclipse centers in 2025, about two years after the last TESS season used in the 2024 study. Shared template bias, changing eclipse shape, and unknown source parameter covariance limit a physical rate comparison. No new planet or new cause of precession is established. The package contains the raw light curves, source hashes, code, all method checks, tables, figures, and reproduction instructions.
PT Vel · TIC 74528791 · TESS · eclipsing binary · apsidal motion · eclipse timing · public astronomical data
References
7- usesdoi:10.1051/0004-6361/202450303
This study uses the prior PT Vel orbit and compares its central forecast with new TESS sector 89 measurements.
- supportsdoi:10.1111/j.1365-2966.2007.12822.x
The timing trend supports the prior evidence for apsidal motion in PT Vel.
- supportsdoi:10.1051/0004-6361/202141484
The sector 8 eclipse interval is close to the early TESS mean interval reported in this study. The samples and event selections differ.
- usesdoi:10.17909/t9-r086-e880
QLP light curves are the main data in six TESS sectors. The input file hashes are preserved.
- usesdoi:10.17909/t9-wpz1-8s54
TESS-SPOC light curves provide extraction checks in five sectors.
- usesdoi:10.1086/683602
The batman software makes the empirical symmetric eclipse profiles and the eccentric spherical-star simulation.
- doi:10.55064/tjaa.1592219
This 2025 compilation was inspected during the search for later PT Vel work.
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