The nature of the TRAPPIST-1 exoplanets.

  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 J. 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},
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… 

A Review of Possible Planetary Atmospheres in the TRAPPIST-1 System

It is shown that (i) Hubble Space Telescope transit observations, (ii) bulk density measurements comparison with H2-rich planets mass-radius relationships, (iii) atmospheric escape modelling, and (iv) gas accretion modelling altogether offer solid evidence against the presence of hydrogen-dominated—cloud-free and cloudy—atmospheres around TRAPPIST-1 planets.

TRAPPIST-1h as an Exo-Titan. I. The Role of Assumptions about Atmospheric Parameters in Understanding an Exoplanet Atmosphere

The TRAPPIST-1 system is home to at least seven terrestrial planets and is a target of interest for future James Webb Space Telescope (JWST) observations. Additionally, these planets will be of

The TRAPPIST-1 JWST Community Initiative

A community initiative aiming to develop a well-defined sequential structure for the study of the TRAPPIST-1 planetary system with JWST and to coordinate on every aspect of its preparation and implementation is presented.

The tidal parameters of TRAPPIST-1b and c

The TRAPPIST-1 planetary system consists of seven planets within 0.05 au of each other, five of which are in a multiresonant chain. These resonances suggest the system formed via planet migration;

Pebble-driven planet formation for TRAPPIST-1 and other compact systems

Recently, seven Earth-sized planets were discovered around the M-dwarf star TRAPPIST-1. Thanks to transit-timing variations, the masses and therefore the bulk densities of the planets have been

How Flat Can a Planetary System Get? I. The Case of TRAPPIST-1

The seven planets orbiting TRAPPIST-1 in a compact near-resonant chain offer a unique case to study in planet formation theory. We demonstrate in this paper that the remarkable flatness of the

Water delivery to the TRAPPIST-1 planets

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.

Tidal heating and the habitability of the TRAPPIST-1 exoplanets

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

  • J. Wright
  • Geology, Physics
    Research Notes of the AAS
  • 2018
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

Characterisation of the hydrospheres of TRAPPIST-1 planets

Context. Planetary mass and radius data suggest that low-mass exoplanets show a wide variety of densities. This includes sub-Neptunes, whose low densities can be explained with the presence of a



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

Temporal Evolution of the High-energy Irradiation and Water Content of TRAPPIST-1 Exoplanets

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

Planet–Planet Occultations in TRAPPIST-1 and Other Exoplanet Systems

We explore the occurrence and detectability of planet–planet occultations (PPOs) in exoplanet systems. These are events during which a planet occults the disk of another planet in the same system,

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

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

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

Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1

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

A resonant chain of four transiting, sub-Neptune planets

The architecture of Kepler-223 is too finely tuned to have been formed by scattering, and numerical simulations demonstrate that its properties are natural outcomes of the migration hypothesis.