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TRAPPIST-1 is a nearby ultra-cool dwarf that is host to a remarkableplanetary system consisting of seven transiting planets. The orbital propertiesand radii of the planets have been well-constrained, and recently the masses ofthe inner six planets have been measured with additional ground and space-basedphotometric observations. Large uncertainties in these mass measurements haveprevented a robust analysis of the planetary compositions. Here we perform manythousands of N-body dynamical simulations with planet properties perturbed fromthe observed values and identify those that are stable for millions of years.This allows us to identify self-consistent orbital solutions that can be usedin future studies. From our range of dynamical masses, we find that most of theplanets are consistent with an Earth-like composition, where TRAPPIST-1f islikely to have a volatile-rich envelope.

Plausible Compositions of the Seven TRAPPIST-1 Planets Using Long-term Dynamical Simulations