Heidelberg Joint Astronomical Colloquium

Speaker Melvyn Davies
Title The dynamical evolution of exoplanet systems

Today we know of almost 700 planets around other stars. Many of these are massive planets, found on tight, and yet eccentric, orbits around their host stars. I will discuss the dynamical evolution of these systems. All stars are formed in some sort of cluster or association. I will discuss 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. In addition, we may also be able to explain a sub-population of hot jupiters, and planets seen recently via direct imaging to be on very wide orbits.