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We set out to explore how best to mitigate the number of period aliases for atransiting TESS system with two identified transits separated by a large timeperiod on the order of years. We simulate a realistic population of doublytransiting planets based on the observing strategy of the TESS primary andextended missions. We next simulate additional observations using photometry(NGTS) and spectroscopy (HARPS and CORALIE) and assess its impact on the periodaliases of systems with two TESS transits. We find that TESS will detect around400 exoplanets that exhibit one transit in each of the primary and extendedmissions. Based on the temporal coverage, each of these systems will have anaverage of 38 period aliases. We find that, assuming a combination of NGTS andCORALIE over observing campaigns spanning 50 days, we can find the true alias,and thus solve the period, for up to 207 of these systems with even more beingsolved if the observing campaigns are extended or we upgrade to HARPS overCORALIE.

Resolving period aliases for TESS monotransits recovered during the extended mission