Hi Guys

PLANET has the follwoing page on constraints on Jupiter type planets in Mars-to-Jupiter range orbits...

http://mplanet.anu.edu.au/fiveyearlimits.news.html

...in sum at most 1/3 of red dwarfs have Jupiter-sized planets in such orbits. Could be less.

Question is now... why? I would suggest that the lower mass of the primary star results in a lower disc mass, which is then less likely to form Jovian planets before the disk is zapped by 0 & B star ultraviolet.

Alternatively, Alan Boss' disk instability mechanism can form Neptunian planets via gas loss via O & B star UV. Such gas loss will be easier from planets around stars with shallower gravity wells.

Or Woolfson's Capture Hypothesis suggests that instead of capturing planets (formed in disks deformed by stellar near-misses in high density stellar nurseries) red dwarfs will tend to lose them. Hence OGLE finding seemingly plenty of brown dwarfs/ free-floating planets.

Hence... too many theories and not enough data. Have to keep looking.

Adam