Simon Albrecht
Department of Physics and Astronomy, Aarhus University, Denmark

Abstract
The architecture of systems harboring extra solar planets is diverse and surprising. This variety poses an interesting challenge as well as an opportunity for improving our understanding of planet formation and evolution.

The talk will focus on recent results pertaining to one specific aspect of exoplanet system architecture: the host star obliquity, which is the angle between the rotation axis of the host star and its orbital angular momentum. i) We found a system where the planets were born on retrograde orbits in a highly misaligned protoplanetary disk. This unusual architectural history was caused by a companion star. ii) We also revealed a preponderance of perpendicular planets, planets which orbit over the poles of their host stars. So far it is unclear what causes this peculiar architecture and I will briefly discuss some possibilities. iii) I will also remark on the highest quality obliquity observations from the last three years and how these can help to solve an outstanding riddle in the field as well as why obliquity in longer period systems are important.

2022 November 17, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto