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

Status Report From: e-Print archive
Posted: Monday, April 10, 2017

Billy Quarles, Elisa V. Quintana, Eric D. Lopez, Joshua E. Schlieder, Thomas Barclay
(Submitted on 7 Apr 2017)

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

Comments:    4 pages, 1 figure, 3 tables, submitted to ApJL
Subjects:    Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:    arXiv:1704.02261 [astro-ph.EP] (or arXiv:1704.02261v1 [astro-ph.EP] for this version)
Submission history
From: Billy Quarles
[v1] Fri, 7 Apr 2017 15:23:08 GMT (301kb,D)

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