8-12 juin, 2014

Résumé

Predicting the Chemical Composition of Exoplanets

Alex Cridland (McMaster University)

Ralph Pudritz (McMaster University)

Understanding the distribution of the chemical compositions in observed Kepler objects is a new and rapidly growing subject. Here we present a model for predicting the chemical composition of a planet as it forms in its natal protoplanetary disk. By combining a planet formation model based on core accretion in planet traps worked through by Hasegawa \& Pudritz 2012, 2013 with detailed chemical models of protoplanetary disks (eg. Fogel et al. 2011) we can predict both the core and atmospheric compositions of a wide range of exoplanets. The former is calculated through an equilibrium condensation sequence, while the latter relies on a robust non-equilibrium chemical code. Both codes are run on a self-similar analytic solution of the diffusion equation for an evolving viscous disk, worked out by Chambers (2009). As the forming planet collects its materiel, the bulk properties of the planet will depend greatly on where and when the planet forms. As a first test of the method we present calculations of the composition of Hot Jupiters which can be compared to observed atmospheric compositions.
(doit être confirmé par le SOC)