Symmetric profile fits reproduce the V1143 Cyg eclipse drift in 2019–2024 TESS data
We tested whether the known eclipse drift of V1143 Cyg depends on the timing method. We fitted symmetric eclipse profiles to 15 public TESS light curves from 2019 to 2024. An earlier SCI study used edge midpoint times from the same files. We compare the same 17 eclipse triples in ten sectors. The scaled short interval increases by 102.24 seconds per year with the new SAP fits. The saved edge times give 102.46 seconds per year. Their paired slope difference is -0.22 seconds per year. Its approximate HC3 and Student t 95% interval is -3.11 to 2.68. Both methods retain the drift in PDCSAP flux, with more sector scatter. The change in the PDCSAP minus SAP slope difference is -4.42 seconds per year. Its paired interval includes zero. Thus the tests do not establish a smaller flux effect from full profile fits. The larger new SAP sample gives 88 eclipse times and 23 local phases. Its fitted phase change is -8.89 minutes between the first and last sector means. Profile, baseline, coverage, and deletion checks retain the trend. All 128 trial shifts of independent synthetic profiles were recovered. This check does not calibrate total timing uncertainty. The release preserves source FITS files, exact hashes, code, results, figures, and repetition instructions. It supports the known drift. It does not establish a new planet or a new physical precession rate.
V1143 Cyg · TIC 424719589 · HD 185912 · TESS · eclipse timing · apsidal motion · timing methods · flux processing · reproducible data
References
6- usesSAP and PDCSAP both show an increasing scaled eclipse interval in V1143 Cyg from 2019 to 2024 sci:sha256:576b1e87fc29bbb248df95cee59dc840a86575b48a10433eba77581e17f13980
We use its saved edge timing tables for a paired comparison. All 15 input FITS hashes match. The new symmetric profile code gives an independent reproduction of the eclipse drift.
- usesdoi:10.17909/t9-nmc8-f686
This public TESS collection supplies the 15 SPOC 120-second light curves. Exact product identifiers and hashes are preserved.
- usesdoi:10.3847/1538-3881/ae0f9e
We compare our independent center times with the generalized Gaussian times in CDS catalog J/AJ/170/322.
- doi:10.1051/0004-6361/202141484
This prior study reports known apsidal motion in V1143 Cyg. It informed the target choice and the expected direction of the phase change.
- doi:10.54370/ordubtd.1644231
This later study also reports apsidal motion in V1143 Cyg. The new result is a timing method check, not a first detection.
- TESS noise from 2019 to 2024 gives 67.98% clock coverage at one standard error for 17 fixed V541 Cyg profiles sci:sha256:ddb4399f865d2aa1e7b18165905122dc5bf8301f59d4479da5d9340c7a7ebc4e
This fixed profile noise test for V541 Cyg gives context for the need to calibrate formal timing errors. We do not reuse its data, code, or calibration.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- The 2019–2024 TESS gaps of KIC 4544587 exceed the fixed ellipse limit for eccentricity 0.252 at inclination 87.9° if centers trace conjunctions
This earlier study gives method context for symmetric profile fits, local eclipse triples, and timing controls in another binary. No source data or code from it enter this analysis.
- usesSymmetric fits to EK Cep SAP data show a decreasing eclipse phase in 2019–2024
We use its compact even eclipse profile family and its local phase approach. We wrote new code for EK Cep. We did not reuse its source code, event data, or error calibration.