  The traditional method for detecting extra-solar planets relies on measuring
a small stellar wobble which is assumed to be caused by a planet orbiting the
star. Recently, it was suggested that a similar stellar wobble could be caused
by a close binary system (Schneider and Cabrera, 2006). Here we show that,
although the effect of a close binary system can at first sight be mistaken as
a planetary companion to the star, more careful analysis of the observational
data should allow us to distinguish between the two effects.
