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The proposed Transiting Exoplanet Survey Satellite (TESS) will survey theentire sky to locate the nearest and brightest transiting extrasolar planetswith orbital periods up to about 36 days. Here we estimate the number and kindof astrophysical false positives that TESS will report, along with the numberof extrasolar planets. These estimates are then used to size the ground-basedfollow-up observing efforts needed to confirm and characterize the planets. Weestimate that the needed observing resources will be about 1400telescope-nights of imaging with 0.5m to 1m-class telescopes, 300telescope-nights with 1m to 2m-class telescopes for the classification of thehost stars and for radial velocity measurements with roughly 1 km/s precision,and 380 telescope-nights with 2m to 4m-class telescopes for radial velocitystudies with precision of a few m/s. Follow-up spectroscopy of the smallestplanets discovered by TESS at the best possible velocity precision will belimited by the number of telescope nights available on 4m to 10m classtelescopes with instruments such as HARPS and HIRES, but the pay-off of suchefforts will be the determination of masses for Super Earths with sufficientaccuracy to distinguish rocky desert planets from water worlds.

Expected Planet and False Positive Detection Rates for the Transiting Exoplanet Survey Satellite