TOIs from the First 10 Months of the TESS Extended Mission

On July 4th 2020, TESS (Transiting Exoplanet Survey Satellite) completed its original two year prime mission, from which 2241 TOIs (TESS Objects of Interest) were alerted. There have been 354 TOIs alerted with data from the extended mission as of April 1st 2021, which is comparable to the 335 TOIs alerted within the first 10 months of the prime mission, and many more TOIs are anticipated. New TOIs from the extended mission are primarily fainter targets missed by the original 10.5 TESS magnitude threshold for vetting, low signal-to-noise targets with increased signal-to-noise from additional data, and single transits from Y1 with additional transits in Y3 allowing possible periods to be identified. Overall, the extended mission TOIs are similar to the prime mission TOIs in terms of period and radius distribution. The proportion of extended mission TOIs with longer periods and smaller radii is slightly larger than primary mission TOIs due to the longer observation baseline. As the extended mission progresses, this trend is expected to continue, allowing TESS to find more TOIs in this sparsely populated region of parameter space.