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We analyze a large number of citizen science data and identify eight HotJupiter systems that show evidence for deviations from a constant orbitalperiod: HAT-P-19 b, HAT-P-32 b, TrES-1 b, TrES-2 b, TrES-5 b, WASP-4 b, WASP-10b, and WASP-12 b. The latter system is already well known to exhibit strongevidence for tidal orbital decay and serves as an important control for thisstudy. Several other systems we identify have disputed period drifts in theliterature, allowing the results here to serve as an independent analysis. Thecitizen science data are from the Exoplanet Transit Database (ETD), which is aglobal project established in 2008 by the Variable Star and Exoplanet Sectionof the Czech Astronomical Society. With over 400 planets and 12,000 contributedobservations spanning 15 years, the ETD is brimming with potential for studyingthe long-term orbital evolution of close-in Hot Jupiters. We use our results todiscuss prioritization of targets for follow up investigations, which will benecessary to confirm the period drifts and their causes.

Evidence of Long-Term Period Variations in the Exoplanet Transit Database (ETD)