Contributed Talk - Splinter Exoplanets

Thursday, 14 September 2023, 16:15   (H 3007)

The role of the star cluster dynamics on the planets

1 Francesco Flammini Dotti, 2 Rainer Spurzem, 3 MBN Thijs Kouwenhoven, 4 Maxwell Tsai, 5 Wei Hao, 6 Shu Qi, 7 Albrecht Kamlah
University of Heidelberg (1,2,7), Xi'An Jiaotong-Liverpool University (3), Leiden Observatory (4), Ludwig-Maximillian University (5), Peking University (6)

The dynamical evolution of planetary systems is an important field that aims to explain how the majority of planets eventually obtain their actual architecture. In a star cluster, it may explain the diversity of their architectures due to their different encounter history. Moreover, there is a relative large abundance of free-floating planets in our galaxy. The star clusters may be a consistent source due to their ejected free-floating planets. In this talk, I will explain how the star cluster density and the presence of a cluster-centric intermediate-mass black hole eventually affects Solar-like systems (i.e., a complex planetary system) and single-planet systems respectively. Furthermore, I will introduce global rotation in the star cluster, and discuss its role in the ejection of both stars and free-floating planets. I will use NBODY6++GPU (a N-body code which performs simulations with a large number of particles, i.e., star clusters) and LonelyPlanets (another N-body code which performs simulations with a low number of particles, i.e., planetary systems). The results confirm that the density of the star cluster is one of the major characteristic in the ejection of planets from their host star, and the planetary architecture has also a predominant role. The intermediate-mass black hole enhances the ejection of planets from the planetary systems as well. Moreover, the ejection of both stars and planets from the star cluster is enhanced as well. Finally, the global rotation of star clusters diminish the ejection of planets from their star cluster even at mid-slow rotational speeds.