Ploonet

This paper explores the scenario where large regular exomoons escape after tidal interchange of angular momentum with its parent planet, becoming small planets by themselves. We name this hypothetical type of object a ploonet.

The researchers, who used simulations to explain the same, found that the simulated Ploonets were quite short-lived, crashing into the star or their parent planet in 0.5-1 million years.

For now, such leftover debris fields may be the best chance for astronomers to infer the existence of ploonets. After all, even if astronomers detect a runaway ploonet orbiting its host star, it would be hard to distinguish it from normal planets.