PHANTOM Candidate TIC 281814030: A 4.89394-Day Transit Signal in TESS Photometry

Status: planet candidate. A periodic transit-like signal on TIC 281814030 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: 281814030 Star: Tmag 14.53, Teff 3449 K, radius 0.456 ± 0.014 R☉, distance 177.7 pc (TIC v8) Period: 4.8939413 ± 0.0000051 d Mid-transit epoch: BJD_TDB 2460911.0777 ± 0.0012 Depth: 12,199 ± 820 ppm Duration: 1.645 ± 0.098 h Radius if on the target: 5.33 +0.24/−0.24 R⊕ (the detailed review's physical fit with the star's density as a prior: its Rp/Rs × the TIC stellar radius, both uncertainties); ± 0.5 R⊕ more as a working allowance for the reduction-dependent depth (see *Detailed review*), not a calibrated 68% interval; the ± 0.24 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: 32 in TESS sectors 2, 28, 29, 69, 96, 103, 104, 105 Detection S/N: 19.4 (PHANTOM's search) Open questions (README.md, Unresolved): Which star the signal comes from; The depth depends on the reduction; No radial-velocity measurement; 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.