Just thought I would drop my two cents in the bucket, as this is a fairly interesting topic (and story).
As for 'terrestrial' type planets, the odds are that Formalhaut has them.
With the location of its 'debris' disk, and the known location and approx mass of Formalhaut b being misaligned with the configuration of the disk, it is almost a certainty that smaller terrestrial type planets inside of Formalhaut b's orbit are responsible for the disk's current configuration.
If some of those planets originated outside of F-b's orbit and migrated in as F-b migrated outward from the primary, they would likely be sufficiently cooled for human exploitation. If the albedo was low enough (read the high ice content he positied on his N/CO2 planet), it would likely have a tolerable temp as well.
Doubt I'd want to move there, but if you didn't have any other options, or it was worth a lot of money to visit/exploit, I'm sure folks would start wandering that direction
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