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Many of the known hot Jupiters are formally unstable to tidal orbital decay.The only hot Jupiter for which orbital decay has been directly detected isWASP-12, for which transit timing measurements spanning more than a decade haverevealed that the orbital period is decreasing at a rate of $dP/dt\approx10^{-9}$, corresponding to a reduced tidal quality factor of about $2\times10^5$. Here, we present a compilation of transit-timing data for WASP-12 andeleven other systems which are especially favorable for detecting orbitaldecay: KELT-16; WASP-18, 19, 43, 72, 103, 114, and 122; HAT-P-23; HATS-18; andOGLE-TR-56. For most of these systems we present new data that extend the timebaseline over which observations have been performed. None of the systemsbesides WASP-12 displays convincing evidence for period changes, with typicalupper limits on $dP/dt$ on the order of $10^{-9}$ or $10^{-10}$, and lowerlimits on the reduced tidal quality factor on the order of $10^5$. One possibleexception is WASP-19, which shows a statistically significant trend, althoughit may be a spurious effect of starspot activity. Further observations areencouraged.

The continuing search for evidence of tidal orbital decay of hot Jupiters