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We report the period, eccentricity, and mass determination for the TESSsingle-transit event candidate TOI-222, which displayed a single 3000 ppmtransit in the TESS two-minute cadence data from Sector 2. We determine theorbital period via radial velocity measurements (P=33.9,days), which allowedfor ground-based photometric detection of two subsequent transits. Our datashow that the companion to TOI-222 is a low mass star, with a radius of$0.18_{-0.10}^{+0.39}$ Rsun and a mass of $0.23\pm0.01$ Msun. This discoveryshowcases the ability to efficiently discover long-period systems from TESSsingle transit events using a combination of radial velocity monitoring coupledwith high precision ground-based photometry.

TOI-222: a single-transit TESS candidate revealed to be a 34-day eclipsing binary with CORALIE, EulerCam and NGTS