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The Hubble has a resolution of 0.05 arc seconds. The Hale 200 inch can do 1 arc second on earth.
For perspective on the current discussion here are some approximate angular sizes of various objects:
Moon 1800 arc seconds
Neptune 2.2 arc secs
Pluto 0.06 - 0.1 arc secs
Canopus 0.006 arc secs
Proxima Centauri 0.001 arc secs
An 8 inch telescope - refractor or reflector can resolve approximately 0.6 arc seconds in a theoretically perfect sky.
Therefore, even with the Hubble you can't get close to resolving the disc of a massive star so you will not get the disk of a much smaller rotating planet. Exoplanets are deduced, not observed, as a result of changes in star brightness.
Richard
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