On Mar 10, 1:35*pm, Hw@..(Henry Wilson DSc) wrote:
They are ordinary stars that have a large orbiting planet.
Their light moves at c+vsin(t/T) towards Earth, causing the photon stream to
spatially bunch up and separate as it travels. This gives the impression of a
periodic brightness variation when it reaches an Earth observer.

For a complete discription of the process see:

http://www.scisite.info/The_new_ball..._of_light.html

Exactly correct, whereas a binary star such as having a brown dwarf or
a very large 16x Mj planet should make a good starshade as it orbits
through our line of sight. Basically most stars have planets, at
least to start with.

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