  We use the distribution of extrasolar planets in circular orbits around stars
with surface convective zones detected by ground based transit searches to
constrain how efficiently tides raised by the planet are dissipated on the
parent star. We parameterize this efficiency as a tidal quality factor (Q*). We
conclude that the population of currently known planets is inconsistent with
Q*<10^7 at the 99% level. Previous studies show that values of Q* between 10^5
and 10^7 are required in order to explain the orbital circularization of main
sequence low mass binary stars in clusters, suggesting that different
dissipation mechanisms might be acting in the two cases, most likely due to the
very different tidal forcing frequencies relative to the stellar rotation
frequency occurring for star--star versus planet--star systems.
