Orbit Dynamics — Resonant Chains and External Companions

Wednesday 4 July, 09:00

This talk is divided into two parts, and focuses on work since Exoplanets I. 

In the first part, we discuss how multiple-planet systems have been found in mean-motion and 3-body resonances, with several outstanding examples (such as TRAPPIST-1) yielding tight constraints on planets' masses, migration history, and even tidal properties. 

In the second part, we review work on what happens to an inner planetary system in the presence of external perturbers such as inclined and eccentric Jupiters.  

The motivation for the latter discussion is the TESS satellite. It will discover systems in architectures like Kepler found — super-Earths and sub-Neptunes close into their star, and some systems will likely be resonant. Also, long-term follow-up via the radial velocity method will find external companions to the systems TESS finds, making the study of hierarchical systems relevant. 

Also, Happy Fourth of July, England!

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