Interesting results..."Even if planet detections are more spectacular, it is also
important to report non-detections, which are required to estimate
the planet frequency. Our non-detections of planets support
the increasing observational evidence of a lower frequency
of Jupiter-mass planets aroundMdwarfs. Endl et al. (2006) estimated
a frequency of ≈ 1% or less up to 1 AU orbital radius for
Jupiter-mass planets aroundM dwarfs compared to 2.5% for solar
like stars. This comparison cannot be done yet for low-mass
planets because they are much harder to detect (and even more
so for G stars), which introduces observational biases. However
low-mass planets seem to be quite frequent around M dwarfs
(Bonfils et al. 2007)."