Fixed 1102-day timing waves reduce forecast errors for TOI-270 c and d in TESS sectors 97 and 98
We measured 13 transits of TOI-270 c and 6 transits of TOI-270 d in TESS sectors 97 and 98. We tested two forecasts fitted only to published 2018–2020 transit times. One model uses a constant period. The other adds a sine and cosine at a fixed 1102.24-day period. For planet c, the root mean square error falls from 58.55 to 1.65 minutes. For planet d, it falls from 52.60 to 5.46 minutes. The package gives the source light curves, individual times, block-resampling errors, alternate fits, and all analysis code. This test covers a five-year gap between data sets. It tests a simple timing wave with an assumed period. It does not test the published model of planetary motion or determine a new planet mass.
TOI-270 · TESS · transit timing · forecast test · public astronomical data
References
7- usesdoi:10.1093/mnras/stab3483
Tables A1–A3 supply the early transit times. Table 3 supplies the search periods and transit geometry.
- usesdoi:10.17909/t9-nmc8-f686
Seven SPOC two-minute light curves supply the public observations.
- usesdoi:10.1086/683602
The batman code calculates the transit light curves.
- doi:10.1038/s41550-019-0845-5
- doi:10.1088/0004-637X/761/2/122
- doi:10.1093/mnras/staf334
- A sine model gave smaller later timing errors than a linear model for 23 of 26 selected Kepler planet pairs sci:sha256:7cc6a1c1ae9085aad128b73ab10f78f82967c8385e8955219cb2461a5ef0032c
A prior test compares fixed-period timing waves with clocks for selected Kepler pairs. The present code and TOI-270 measurements are independent.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- usesTen starts per transit change the TOI-270 d width contrast from 2.6 to 8.0 minutes under a fixed template and weights in seven TESS sectors
This signed study supplied seven original TESS FITS files, archive records, and the initial transit shape recipe.
- usesA free common timing wave fits 51 published TESS times for TOI-270 c and d with a period near 1110 days
Its signed package supplies the early timing table, the late TESS timing measurements, their errors, and eight extraction choices. We extend its fixed-period forecast test with a free-period search.