The nature of the TRAPPIST-1 exoplanets.

@article{Grimm2018TheNO,
  title={The nature of the TRAPPIST-1 exoplanets.},
  author={Simon L. Grimm and B-O. Demory and Micha{\"e}l Gillon and Caroline Dorn and Eric Agol and Artem Burdanov and Laetitia Delrez and Marko Sestovic and Amaury H. M. J. Triaud and Martin Turbet and 'Emeline Bolmont and Anthony Caldas and Julien de Wit and Emmanuel Jehin and J{\'e}r{\'e}my Leconte and Sean N. Raymond and Val{\'e}rie Van Grootel and Adam J. Burgasser and Sean Carey and Daniel C. Fabrycky and Kevin Heng and David M. Hernandez and James G. Ingalls and Susan M. Lederer and Franck Selsis and Didier Queloz},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2018}
}
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… 
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Three of the seven rocky planets (e, f, and g) in TRAPPIST-1 system orbit in the habitable zone of the host star. Therefore, water can be in liquid state at their surface being essential for life.
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Context. New estimates of the masses and radii of the seven planets orbiting the ultracool M-dwarf TRAPPIST-1 star permit improved modelling of their compositions, heating by tidal dissipation, and
Planet–Planet Tides in the TRAPPIST-1 System
The star TRAPPIST-1 hosts a system of seven transiting, terrestrial exoplanets apparently in a resonant chain, at least some of which are in or near the Habitable Zone. Many have examined the roles
Impact of tides on the transit-timing fits to the TRAPPIST-1 system
Transit timing variations (TTVs) can be a very efficient way of constraining masses and eccentricities of multi-planet systems. Recent measurements of the TTVs of TRAPPIST-1 have led to an estimate
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A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c
TLDR
Observations of the combined transmission spectrum of the two inner planets during their simultaneous transits on 4 May 2016 rule out cloud-free hydrogen-dominated atmospheres for each planet at ≥10σ levels; TRAPPIST-1 b and c are therefore unlikely to have an extended gas envelope as they occupy a region of parameter space in which high-altitude cloud/haze formation is not expected to be significant for hydrogen- dominated atmospheres.
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman-α line
The TRAPPIST-1 system offers the opportunity to characterize terrestrial, potentially habitable planets orbiting a nearby ultracool dwarf star. We performed a four-orbit reconnaissance with the Space
Formation of TRAPPIST-1 and other compact systems
TRAPPIST-1 is a nearby 0.08  M ⊙ M-star that was recently found to harbor a planetary system of at least seven Earth-sized planets, all within 0.1 au. The configuration confounds theorists as the
Stellar Parameters for Trappist-1
TRAPPIST-1 is an ultracool dwarf star transited by seven Earth-sized planets, for which thorough characterization of atmospheric properties, surface conditions encompassing habitability, and internal
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The ultracool dwarf star TRAPPIST-1 hosts seven Earth-size transiting planets, some of which could harbor liquid water on their surfaces. Ultraviolet observations are essential to measuring their
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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
Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
TLDR
The observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1, and the six inner planets form a near-resonant chain, such that their orbital periods are near-ratios of small integers.
Early 2017 observations of TRAPPIST-1 with Spitzer
The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate
Inward migration of the TRAPPIST-1 planets as inferred from their water-rich compositions
Multiple planet systems provide an ideal laboratory for probing exoplanet composition, formation history and potential habitability. For the TRAPPIST-1 planets, the planetary radii are well
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