  We present a technique for verifying or refuting exoplanet candidates from
the Transiting Exoplanet Survey Satellite (TESS) mission by searching for
nearby eclipsing binary stars using higher-resolution archival images from
ground-based telescopes. Our new system is called Detecting and Evaluating A
Transit: finding its Hidden Source in Time-domain Archival Records (DEATHSTAR).
We downloaded time series of cutout images from two ground-based telescope
surveys (the Zwicky Transient Facility, or ZTF, and the Asteroid
Terrestrial-impact Last Alert System, or ATLAS), analyzed the images to create
apertures and measure the brightness of each star in the field, and plotted the
resulting light curves using custom routines. Thus far, we have confirmed
on-target transits for 17 planet candidates, and identified 35 false positives
and located their actual transit sources. With future improvements to
automation, DEATHSTAR will be scaleable to run on the majority of TOIs.
