Poster Presentation

Spin-orbit Angle and Exoplanetary Formation: Probing Star-Disc Inclination in Exoplanetary Systems

Author(s): Wing Yu Siu (ASIAA), Christian Flores (ASIAA), Nagayoshi Ohashi (ASIAA), Mayank Narang (ASIAA), Masayuki Yamaguchi (ASIAA)

Presenter: Wing Yu Siu (ASIAA, research assistant)

The spin-orbit angle, defined as the angle between a star's rotation axis and a planet's orbital plane, holds significance in the study of the dynamics and formation mechanisms of planetary systems. Unlike our solar system, it has been well stablished that some exoplanets, particularly hot Jupiters, exhibit a significant spin-orbit misalignment. It is unclear what causes the misalignment, yet several mechanisms can be at play, some during the formation of the planetary system, others once planets are fully formed. In this study, we investigate the role of star and planet formation processes in imprinting spin-orbit misalignment on exoplanets. Through a comparative analysis of stellar and disk inclinations, we aim to observe the occurrence rate of spin-orbit misalignment and to study its dependence on host star properties such as the stellar effective temperatures, masses, projected rotational velocities, and rotation periods. Our study builds upon previous research by expanding the dataset of host stars, with 38 sources of star-disc systems in total, contributing to a deeper understanding of star and planet formation.