PHANTOM Candidate TIC 394780667: A 2.37897-Day Transit Signal in TESS Photometry

Status: planet candidate. A periodic transit-like signal on TIC 394780667 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: 394780667 Star: Tmag 13.63, Teff 3931 K, radius 0.677 ± 0.020 R☉, distance 242.8 pc (TIC v8) Period: 2.3789686 ± 0.0000061 d Mid-transit epoch: BJD_TDB 2459389.6932 ± 0.0023 Depth: 3,106 ± 296 ppm Duration: 1.96 ± 0.19 h Radius if on the target: 3.75 +0.18/−0.18 R⊕ (the detailed review's physical fit with the star's density as a prior: its Rp/Rs × the TIC stellar radius, both uncertainties); ± 0.35 R⊕ more as a sensitivity allowance for the depth's dependence on the reduction and the epoch (half the difference between TGLC's sectors 12-39, 4.2 R⊕, and PHANTOM's 66-94, 3.5 R⊕; see *Detailed review*), not a calibrated 68% interval Transits meeting the fit's coverage criterion: 80 in TESS sectors 12, 13, 27, 39, 66, 67, 93, 94 Detection S/N: 15.5 (PHANTOM's search) The full record, with the evidence, uncertainties, data sources, cross-matches, unresolved questions and publication history, is README.md in this deposit.