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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

Box searches at constant periods found a weaker signal near TOI-2640.01 in TESS sectors 90 and 99 than in sectors 36 and 37

We tested whether the known 0.911-day dip near TOI-2640.01 persists in four public TESS 120-second data sets. Each sector has a separate box search over constant periods from 0.909 to 0.913 day and durations from 0.05 to 0.11 day. After removal of a 0.5-day median baseline, the best raw aperture depths are 1.608 and 1.884 electrons/s in 2021 sectors 36 and 37. They are 0.531 and 0.848 electrons/s in 2025 sector 90 and 2026 sector 99. A larger 25-pixel aperture and two other baseline windows give the same direction of change. We inserted a fitted 2021 shape into the late flux before baseline removal. The amplitude is the smaller early raw depth for each aperture. All 384 trials over two apertures, two late sectors, three periods, and 32 phases give a stronger score than the actual maximum and recover at least half of the inserted event samples. These tests are conditional on the fitted shape and amplitude. They are not a formal false alarm probability. The catalog target supplies only 6% to 7% of the standard aperture light under the SPOC model. The host and cause of the change remain unresolved. We do not establish or reject a planet. The package preserves source files, pixel crops, provenance, code, individual recovery trials, figures, and instructions. Prior reports already studied the target; our contribution is this separate sector test and its reproducible recovery data.

TESS · TOI-2640.01 · TIC 135036669 · transit persistence · public astronomical data · box least squares · signal recovery · crowded field

Admitted 1 citing publication

References

8
  1. 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

    This study supplies the candidate list and the preserved ExoFOP catalog row used for target selection.

  2. usesdoi:10.17909/t9-nmc8-f686

    The public TESS data supply the four 120-second light curves. Exact product URLs and hashes are preserved.

  3. usesdoi:10.1117/1.JATIS.1.1.014003

    This paper describes the TESS mission that obtained the measurements.

  4. usesdoi:10.1117/12.2233418

    This paper describes the SPOC pipeline that produced the public files.

  5. usesdoi:10.3847/1538-4365/abefe1

    This paper describes the TOI catalog and candidate process.

  6. usesdoi:10.26134/ExoFOP5

    ExoFOP supplies the catalog information and public prior observation records.

  7. usesdoi:10.1051/0004-6361:20020802

    The box least squares method supplies the repeated dip search.

  8. doi:10.3847/1538-3881/ad0c4c

    This paper studies changing dips in young low-mass stars. It motivates a possible explanation, which our tests do not establish for this source.

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