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We apply the ${\tt weirddetector}$, a nonparametric signal detectionalgorithm based on phase dispersion minimization, in a search for lowduty-cycle periodic signals in the Transiting Exoplanet Survey Satellite (${\itTESS}$) photometry. Our approach, in contrast to commonly used model-basedapproaches specifically for flagging transits, eclipsing binaries, or othersimilarly periodic events, makes minimal assumptions about the shape of aperiodic signal, with the goal of finding "weird" signals of unexpected orarbitrary shape. In total, 248,301 ${\it TESS}$ sources from the first-yearSouthern sky survey are run through the ${\tt weirddetector}$, of which wemanually inspect the top 21,500 for periodicity. To minimize false-positives,we here only report on the upper decile in terms of signal score, a sample forwhich we obtain 97% recall of ${\it TESS}$ eclipsing binaries and 62% of theTOIs. In our sample, we find 377 previously unreported periodic signals, forwhich we make a first-pass assignment that 26 are ultra-short periods ($<0.3$d), 313 are likely eclipsing binaries, 28 appear planet-like, and 10 aremiscellaneous signals.

Hundreds of new periodic signals detected in the first year of $\it{TESS}$ with the ${\tt weirddetector}$