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It didn't form close to its sun. The planet would've migrated in as it was forming, or after it fully formed and was interacting with the last remnants of the accretion disk and the other planets...if it what's left of a gas giant. If it's a terrestrial planet, then it probably did form where it is, or close by, or it maybe an ice giant, like Neptune, that's undergone the migration route.
55Cancri, btw, is smaller than the Sun...it's G8.
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