The giants might've been kicked out, left to live a rogue lifestyle.

Scientists want to search for life in this double star system devoid of giant exoplanets. Here's why

Source: space
Source Link: https://www.space.com/space-exploration/search-for-life/why-scientists-want-to-search-for-life-in-this-double-star-system-devoid-of-giant-exoplanets