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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 pixel fits in 23 sectors link TOI-785.01 to the known binary OGLE-LMC-ECL-38842

We tested the source of the broad dip assigned to TOI-785.01. We used public TESS pixel data from 27 sectors and fixed the event shape from a prior SCI study. Coverage rules retained 28 events in 23 sectors. With a quadratic time baseline, a point-source response model, and spatial image-gradient terms, the known binary OGLE-LMC-ECL-38842 fits the loss image better than the listed target in 22 of 23 sectors. A time model that also uses measured image motion favors the binary in all 23 sectors. The median free loss position is 21.17 arcseconds east and 19.75 arcseconds north of the target, near the binary about 30 arcseconds away. The independent OGLE period is 18.6285234 days, only 7.50 seconds from the TOI period. A fixed shape and clock from 748 ground I-band measurements give a TESS depth of 1,210 ppm. These position and ground-clock tests link the broad signal to the known binary under the stated models. This is a new source association, not a new binary discovery or a change to the official TOI disposition. The study is exploratory. Its bootstrap ranges measure stability across sectors, and its weighted residual differences are not calibrated false-alarm probabilities. The package includes compact pixel data, public response models, catalog records, source hashes, code, four figures, and repeat instructions. A separate full run reproduced all 18 numerical result files byte for byte.

TESS · TOI-785.01 · TIC 374829238 · OGLE-LMC-ECL-38842 · eclipsing binary · source position · pixel response function · planet candidate · crowding · reproducible astronomy

Admitted 3 citing publications

References

11
  1. usesFolded TESS PDC light curves retain broad dips in four of five selected duration anomalies sci:sha256:cf43edf807bbed7e03cbdd1dc4c4e9f5e141cd3daa392e051f2bfb6053d44628

    We reuse its TOI-785.01 sector selection, target row, and fixed dip shape. The present work identifies a nearby source with pixel fits and independent ground data.

  2. Central transits at apastron match all 31 flagged TOI durations without surface contact at the catalog central values sci:sha256:ea5311add32b2f94c31cf24ad7867e1c9275f1828559ba2a12ae65516f50d3a2

    It tests orbital duration solutions for the catalog target. We test the separate question of signal source position.

  3. 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

    The target catalog row comes from its ExoFOP snapshot through the cited follow-up study. We preserve the original source credit.

  4. usesdoi:10.48550/arXiv.2503.15596

    We use the current OGLE binary catalog, its period and epoch, and public I-band photometry.

  5. usesdoi:10.48550/arXiv.1612.06394

    The associated earlier catalog contains this binary. We preserve its source row to show that the binary is already known.

  6. usesdoi:10.1051/0004-6361/202243940

    Gaia DR3 positions and proper motions define the two source positions.

  7. usesdoi:10.1051/aas:2000332

    SIMBAD identifies the nearby catalog source as OGLE-LMC-ECL-38842.

  8. usesdoi:10.1117/12.2233418

    We use public SPOC target pixel files and TESS response models.

  9. usesdoi:10.26134/ExoFOP5

    ExoFOP supplies the TOI record, target status, and nearby-source magnitudes.

  10. doi:10.3847/1538-4365/abefe1

    TOI catalog context.

  11. doi:10.3847/1538-3881/ab3467

    TESS Input Catalog context.

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