On 23Feb2017 1058, C. Berry wrote:
> I am very surprised that such a system is dynamically stable. You'd
> expect planets that close together to perturb one another quite a bit.
> I'm looking forward to reading more about this.

I expect that they're in a set of 'interlocking' harmonics with each other.

That, and tidal effects from it and their close spacing may mean that
they are not (all) tidally locked to the primary, too.

--
Rupert Boleyn <xxxxxx@gmail.com>
Chief Assistant to the Assistant Chief