Calculations show that planets very close to their stars rotate inward and are swallowed up by stars, which should have happened sooner given the current size of the planet’s parent star. So how did this planet defy probability?
Researchers suggest that the system originally consisted of a double star with an orbiting planet. As a star expanded, it lost its atmosphere, leaving behind a helium-rich core.
Eventually, the smaller star engulfed its companion, which led to the fusion of helium and arrest of the even smaller star’s expansion. 8 It is possible that this is how the star reached its current size without “eating” Ursae Minoris b.
Source: Ferra
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