NGTS-11 b / TIC-54002556 b: A transiting warm Saturn recovered from a TESS single-transit event

摘要: We report the discovery of NGTS-11 b (=TIC-54002556 b), a transiting Saturn in 35.46-day orbit around mid K-type star (Teff=5050+-80 K). The system was initially identified from single-transit event in our TESS full-frame image light-curves. Following seventy-nine nights photometric monitoring with an NGTS telescope, we observed second full transit approximately one year after event. NGTS confirmed the parameters signal and restricted orbital period to set of 13 discrete periods. combined detections precise radial velocity measurements determine true measure mass of planet. find has radius 0.823+-0.035 RJup, mass of 0.37+-0.14 MJup, an equilibrium temperature just 440+-40 K, making it one coolest known gas giants. is first exoplanet be discovered being initially as single transit event, its highlights power intense photometric monitoring recovering longer-period exoplanets from single-transit events.