Artist's view of the planets in TOI-178. Credit: ESO.

The sizes and masses of the planets, however, don’t follow such an orderly pattern. This finding challenges current theories of planet formation.
The study has now been published in Astronomy & Astrophysics with Adrien Leleu (University of Geneva and Bern) leading the team that includes five Swedish researchers, two from the Department of Astronomy, Stockholm University: Alexis Brandeker and Göran Olofsson.

Read more about the discovery in the press release from the European Southern Observatory (ESO):