Earth-sized Moon with Host Planet launched from Star System

Could a planet with the size and characteristics of the Earth orbit a gas giant and would the earth-like moon be able to maintain its orbit if the gas giant went rogue and was launched from its host star?

I am interested in setting up a moon that had life on its surface until its host planet left its star system at which point the moon cooled. Once in interstellar space life hung on but around hydrothermal vents fueled by remaining geologic activity. Eventually the gas giant and its moon drift into a new star system and new life forms evolve to use the energy provided by their new host star.

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Earth-sized Moon with Host Planet launched from Star System

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