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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

TESS SAP data show weaker TOI-2640 dimming in 2025 and 2026 for the 2021 shape and the SPOC crowding model

We tested whether the 0.911-day dimming assigned to TOI-2640.01 (TIC 135036669) retains its 2021 strength in later TESS data. We fitted a 2.079-hour empirical shape to sectors 36 and 37. We then searched periods from 0.908 to 0.915 days and all phases in each of four sectors. With the SPOC crowding model, the strongest fitted depths are 6.73% and 7.53% in 2021, 1.88% in sector 90 (2025), and 3.56% in sector 99 (2026). Raw fractional aperture depths also decrease. Local fits to unfiltered data and independent small pixel apertures support lower later losses. At a conservative 2021 depth of 6.024%, artificial signals are recovered in all 32 known-period trials and all eight full-search trials per later sector. These finite tests establish sensitivity to the tested shape; they do not give a global false alarm rate or complete detection probability. The source remains uncertain: only 6-7.4% of the SPOC aperture light is assigned to the target, a brighter Gaia star lies within one TESS pixel, and a larger aperture retains a 2025 periodic signal. Earlier automated PDCSAP fits give different individual-event depths; this difference between methods remains unresolved. The result is a measured reduction under the stated shape and crowding assumptions. It does not confirm a planet, establish an intrinsic change in a specific star, or show that all dimming disappeared. The package preserves lossless input subsets, original file hashes, source queries, code, figures, individual tests, and reproduction instructions.

TESS · TOI-2640.01 · TIC 135036669 · transit candidates · variable stars · crowding · injection recovery · public astronomical data

Admitted 2 citing publications

References

11
  1. usesTESS TOI durations longer than the circular-orbit limit for the catalogue star flag 6.5% of false positives, 0.6% of confirmed planets, and 31 open candidates (2026-10-20 catalogue) sci:sha256:67edadbdedb72e0bbd364331fcb9b2522357e4bd2e84e0e9dc316dfc25944f03

    Its catalogue duration flag helped select TOI-2640.01. We add a direct comparison of public TESS time series.

  2. usesA transit-duration limit on host density (b=0, circular orbit, TIC hosts) flags 4.6% of TESS false positives, 0.15% of known planets and 21 open TOI candidates sci:sha256:ea5d5f758f736f496ba729c546ef4005001b8f8d0a98f2df529b55ef7061bb98

    Its host-density flag also lists the target. We test the light curves without assuming that the catalogue star is the proved source.

  3. usesdoi:10.1117/1.JATIS.1.1.014003

    The TESS mission produced the public observations used here.

  4. usesdoi:10.3847/1538-4365/abefe1

    The TOI catalogue gives the known signal and target context.

  5. usesdoi:10.26134/ExoFOP5

    ExoFOP preserves the selected target parameters and earlier observing records.

  6. usesdoi:10.1051/0004-6361/202243940

    Gaia DR3 positions and magnitudes describe the crowded field.

  7. doi:10.3847/1538-3881/ad0c4c

    Changing periodic dips in low-mass stars give physical context. The target is absent from the checked published table; we do not assign that class.

  8. usesdoi:10.1038/s41586-020-2649-2

    NumPy supplies array calculations and the event bootstrap.

  9. usesdoi:10.1038/s41592-019-0686-2

    SciPy supplies the median filter and nonlinear fit.

  10. usesdoi:10.1109/MCSE.2007.55

    Matplotlib makes the original figures.

  11. usesdoi:10.3847/1538-4357/ac7c74

    Astropy reads FITS products and maps catalogue positions into detector coordinates.

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