TIC 140580920 b: A Hot Jupiter Candidate Orbiting a G-type Subgiant, Discovered in a Blind TESS Full Frame Image Survey

We present TIC 140580920 b, a hot Jupiter candidate identified in a blind photometric survey of 8,774 stars using data from the Transiting Exoplanet Survey Satellite (TESS). The host, TIC 140580920 (TYC 9160-1240-1; d = 454±5 pc; Teff = 5967±127 K; log g = 4.056±0.10; R* = 1.621±0.072 Rsun), is a G-type subgiant observed across 23 TESS sectors spanning 954.6 days. The candidate transits with orbital period P = 2.279748 d, a depth of 2793 ppm, and a total duration of 3.988 h. Mandel-Agol transit modelling returns an impact parameter b = 0.07 and planet radius Rp = 0.834±0.037 RJup; the uncertainty is propagated from the TIC stellar radius uncertainty. The equilibrium temperature is Teq ≈ 1961 K. No secondary eclipse is detected at phase 0.5 (depth < 40 ppm, 3-sigma; < 1.5% of the primary depth). Odd-even transit depth consistency (53+53 transit windows) is 0.29 sigma. The false-positive probability (FPP) is 0.34% and the Nearby False Positive Probability (NFPP) is 0.0007% from triceratops (N = 5×10^6 draws; 25 neighbour stars; dominant scenario TP (71.22%), with PTP at 20.75% and DTP at 7.69%) and both below the validated-planet criteria of Giacalone et al. (2021). A photometric centroid analysis using 32 TESS sectors finds an in-transit offset of 0.00076 px (0.016 arcsec, 1.3 sigma), consistent with an on-target signal. TIC 140580920 b is not listed in any confirmed exoplanet catalogue; the TESS eclipsing binary catalogue records the target with no signal parameters (unconfirmed), consistent with the planetary interpretation. APOGEE DR17 spectroscopy gives [M/H] = -0.07±0.01 (Claytor et al. 2024), consistent with near-solar metallicity; the Gaia DR3 RUWE of 1.897 warrants high-resolution imaging to exclude a sub-arcsecond companion. Radial velocity observations are needed to confirm the planetary nature of the companion; the expected semi-amplitude is K ~ 120 m/s.