Authors
Simon L Grimm, Brice-Olivier Demory, Michaël Gillon, Caroline Dorn, Eric Agol, Artem Burdanov, Laetitia Delrez, Marko Sestovic, Amaury HMJ Triaud, Martin Turbet, Émeline Bolmont, Anthony Caldas, Julien de Wit, Emmanuël Jehin, Jérémy Leconte, Sean N Raymond, Valérie Van Grootel, Adam J Burgasser, Sean Carey, Daniel Fabrycky, Kevin Heng, David M Hernandez, James G Ingalls, Susan Lederer, Franck Selsis, Didier Queloz
Publication date
2018/5/1
Journal
Astronomy & Astrophysics
Volume
613
Pages
A68
Publisher
EDP Sciences
Description
Context
The TRAPPIST-1 system hosts seven Earth-sized, temperate exoplanets orbiting an ultra-cool dwarf star. As such, it represents a remarkable setting to study the formation and evolution of terrestrial planets that formed in the same protoplanetary disk. While the sizes of the TRAPPIST-1 planets are all known to better than 5% precision, their densities have significant uncertainties (between 28% and 95%) because of poor constraints on the planet’s masses.
Aims
The goal of this paper is to improve our knowledge of the TRAPPIST-1 planetary masses and densities using transit-timing variations (TTVs). The complexity of the TTV inversion problem is known to be particularly acute in multi-planetary systems (convergence issues, degeneracies and size of the parameter space), especially for resonant chain systems such as TRAPPIST-1.
Methods
To overcome these challenges, we have used a novel method that …
Scholar articles
SL Grimm, BO Demory, M Gillon, C Dorn, E Agol… - Astronomy & Astrophysics, 2018