Refining the Transit-timing and Photometric Analysis of TRAPPIST-1: Masses, Radii, Densities, Dynamics, and Ephemerides

@article{Agol2020RefiningTT,
  title={Refining the Transit-timing and Photometric Analysis of TRAPPIST-1: Masses, Radii, Densities, Dynamics, and Ephemerides},
  author={Eric Agol and Caroline Dorn and Simon L. Grimm and Martin Turbet and Elsa Ducrot and Laetitia Delrez and Micha{\"e}l Gillon and B-O. Demory and Artem Burdanov and Khalid Barkaoui and Zouhair Benkhaldoun and {\'E}meline Bolmont and Adam J. Burgasser and Sean Carey and Julien de Wit and Daniel C. Fabrycky and Daniel Foreman-Mackey and Jonas Haldemann and David M. Hernandez and James G. Ingalls and Emmanuel Jehin and Zachary L. Langford and J{\'e}r{\'e}my Leconte and Susan M. Lederer and Rodrigo Luger and Renu Malhotra and Victoria S. Meadows and Brett M. Morris and Francisco J. Pozuelos and Didier Queloz and Sean N. Raymond and Franck Selsis and Marko Sestovic and Amaury H. M. J. Triaud and Val{\'e}rie Van Grootel},
  journal={The Planetary Science Journal},
  year={2020},
  volume={2}
}
We have collected transit times for the TRAPPIST-1 system with the Spitzer Space Telescope over four years. We add to these ground-based, HST, and K2 transit-time measurements, and revisit an N-body dynamical analysis of the seven-planet system using our complete set of times from which we refine the mass ratios of the planets to the star. We next carry out a photodynamical analysis of the Spitzer light curves to derive the density of the host star and the planet densities. We find that all… 
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