This 'forbidden' exoplanet is way too massive for its star :

Astronomers have discovered a planet 13 times as massive as Earth orbiting a star nine times less massive than the sun, a disparity in size that shouldn’t exist and challenges planet formation models.

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Megan Delamer , Suvrath Mahadevan , Sagan Fellow In Astrophysics At Princeton University , Penn State University Verne , Penn State Megan Delamer , Habitable Zone Planet Finder , Hobby Eberly Telescope , Donald Observatory , Princeton University , Hlhs , Iminutive Star , Protoplanetary Disk , Extrasolar Planet , Parent Star , Massive Planet , Mahadevan ,