Finding Exomoons Using Their Host Planet's Wobble

Exoplanets aren’t the only objects floating around other stars - they likely have comets and asteroids as well. Even some of the exoplanets themselves will have “exomoons”, at least according to our current understanding of the physics of planetary formation. However, we have yet to find any of these other objects conclusively, though there has been some hint at the presence of exomoons in the last ten years. A new paper from astronomers at the European Southern Observatory (ESO), recently pre-published on arXiv, suggests a way in which we might be able to finally detect the presence of an exomoon - using a technique that is also commonly used to find exoplanets themselves.