PHANTOM Candidate TIC 200807126: A 2.76515-Day Transit Signal in TESS Photometry

Status: planet candidate. A periodic transit-like signal on TIC 200807126 found by PHANTOM (Planet Hunting Across Noisy TESS Observations and Measurements), an independent search of NASA TESS photometry. It has not been confirmed as a planet: its source star and nature are not yet established by follow-up observations (see Unresolved). Version 1.0 of this record. TIC: 200807126 Star: Tmag 14.46, Teff 3491 K, radius 0.423 ± 0.013 R☉, distance 158.1 pc (TIC v8) Period: 2.7651486 ± 0.0000027 d Mid-transit epoch: BJD_TDB 2459153.1055 ± 0.0011 Depth: 9,292 ± 661 ppm Duration: 1.345 ± 0.094 h Radius if on the target: 4.22 +0.21/−0.20 R⊕ (the detailed review's physical fit with the star's density as a prior: its Rp/Rs × the TIC stellar radius, both uncertainties); ± 0.3 R⊕ more as a working allowance for the reduction-dependent depth (see *Detailed review*), not a calibrated 68% interval; the ± 0.21 R⊕ above does not include it. It assumes the dip is on the target with no dilution beyond the photometry's own Transits meeting the fit's coverage criterion: 47 in TESS sectors 3, 4, 30, 31, 97 Detection S/N: 17.4 (PHANTOM's search) Open questions (README.md, Unresolved): The depth depends somewhat on the reduction; No single-transit pixel views; No radial-velocity measurement precise enough for the planet; Not statistically validated. The full record, with the evidence, uncertainties, data sources, cross-matches, unresolved questions and publication history, is README.md in this deposit.