Events in Physics
Melvyn Davies (University of Lund)
Location: PS1.28
Title: The Dynamics of Exoplanets Systems
Stellar birth environments are dangerous environments for planetary systems.
I will describe how planetary systems are vulnerable to perturbations
from passing stars and stellar companions within stellar clusters. These
I will describe how planetary systems are vulnerable to perturbations
from passing stars and stellar companions within stellar clusters. These
perturbations may lead to a chain of events that result in the ejection of some planets,
leaving those remaining on tighter, and eccentric, orbits. Planetary
systems may exchange into binary systems and then the stellar companion
may perturb planetary orbits via the Kozai mechanism. I will show how
this can lead to strong dynamical interactions between planets in a planetary
system, with some planets being ejected. In some cases, planets
placed on extremely eccentric orbits may form hot jupiters via tidal interactions.
By using full N-body calculations of young stellar clusters, I quantify the
frequency of both fly-by encounters and binary-exchange encounters,
and also the frequency of close encounters involving protoplanetary discs.
I compute the fraction of planetary systems likely to emerge unscathed
from a stellar cluster.
systems may exchange into binary systems and then the stellar companion
may perturb planetary orbits via the Kozai mechanism. I will show how
this can lead to strong dynamical interactions between planets in a planetary
system, with some planets being ejected. In some cases, planets
placed on extremely eccentric orbits may form hot jupiters via tidal interactions.
By using full N-body calculations of young stellar clusters, I quantify the
frequency of both fly-by encounters and binary-exchange encounters,
and also the frequency of close encounters involving protoplanetary discs.
I compute the fraction of planetary systems likely to emerge unscathed
from a stellar cluster.