Quote:
Originally Posted by Brett
No. A gaseous body of 4,000 Earth-masses is getting on for being a brown dwarf rather than a gas giant, but L4 and L5 are just as far from the planet as they are from the star, so any radiation hazard from the planet will be dwarfed by that from the star.
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Yeah, you've got an extremely large super-Jupiter but even if its' magnetosphere is in proportion to its; mass (c.12x Jupiter) L4 or 5 would be about 1 AU away. The radiation belts won't stretch that far.
The Earth-type planet might still need a largish moon of its' own to avoid tidal locking or at least length of day issues.