So what's causing this activity? The researchers point out that Fomalhaut A already has a known exoplanet mixing things up from deep inside the dusty ring. Also, gravitational interactions between Fomalhaut A and C could be a huge factor.
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"We thought that the Fomalhaut A system was disturbed by a planet on the inside - but now it looks like a small star from the outside could also influence the system. A good test of this hypothesis is to measure (Fomalhaut C's) exact orbit over the next few years," said Paul Kalas, of the University of California.
The relationship between Fomalhaut A and C could go beyond their gravitational interplay, Fomalhaut C could also have hidden exoplanets in tow, jostling the comets from the inside.
This research is fascinating as it demonstrates how young, widely spaced stars interact with one another - an ideal test to see how star systems mold each other's planetary destiny.
Publication: Discovery of the Fomalhaut C debris disc, Kennedy et al., MNRAS, 2013. doi:10.1093/mnrasl/slt168