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We report the discovery of NGTS-11 b (=TOI-1847 b), a transiting Saturn in a35.46-day orbit around a mid K-type star (Teff=5050 K). We initially identifiedthe system from a single-transit event in a TESS full-frame image light-curve.Following seventy-nine nights of photometric monitoring with an NGTS telescope,we observed a second full transit of NGTS-11 b approximately one year after theTESS single-transit event. The NGTS transit confirmed the parameters of thetransit signal and restricted the orbital period to a set of 13 discreteperiods. We combined our transit detections with precise radial velocitymeasurements to determine the true orbital period and measure the mass of theplanet. We find NGTS-11 b has a radius of 0.817+0.028-0.032 $R_J$, a mass of0.344+0.092-0.073 $M_J$, and an equilibrium temperature of just 435+34-32 K,making it one of the coolest known transiting gas giants. NGTS-11 b is thefirst exoplanet to be discovered after being initially identified as a TESSsingle-transit event, and its discovery highlights the power of intensephotometric monitoring in recovering longer-period transiting exoplanets fromsingle-transit events.

NGTS-11 b / TOI-1847 b: A transiting warm Saturn recovered from a TESS single-transit event