A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c
@article{Wit2016ACT, title={A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c}, author={Julien de Wit and Hannah R. Wakeford and Micha{\"e}l Gillon and Nikole K. Lewis and Jeff A. Valenti and B-O. Demory and Adam J. Burgasser and Artem Burdanov and Laetitia Delrez and Emmanuel Jehin and Susan M. Lederer and Didier Queloz and Amaury H. M. J. Triaud and Val{\'e}rie Van Grootel}, journal={Nature}, year={2016}, volume={537}, pages={69-72} }
Three Earth-sized exoplanets were recently discovered close to the habitable zone of the nearby ultracool dwarf star TRAPPIST-1 (ref. 3). The nature of these planets has yet to be determined, as their masses remain unmeasured and no observational constraint is available for the planetary population surrounding ultracool dwarfs, of which the TRAPPIST-1 planets are the first transiting example. Theoretical predictions span the entire atmospheric range, from depleted to extended hydrogen-dominated…
124 Citations
Atmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1
- Physics, Geology
- 2018
Seven temperate Earth-sized exoplanets readily amenable for atmospheric studies transit the nearby ultracool dwarf star TRAPPIST-1 (refs 1,2). Their atmospheric regime is unknown and could range from…
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman-α line
- Physics, Geology
- 2017
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…
Temporal Evolution of the High-energy Irradiation and Water Content of TRAPPIST-1 Exoplanets
- Physics, Geology
- 2017
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…
Atmospheric escape from the TRAPPIST-1 planets and implications for habitability
- Physics, GeologyProceedings of the National Academy of Sciences
- 2017
The atmospheric escape rates numerically and analytically for the planets of the TRAPPIST-1 system are determined and it is shown that the outer planets are potentially likely to retain their atmospheres over billion-year timescales.
Ground-based Optical Transmission Spectroscopy of the Small, Rocky Exoplanet GJ 1132b
- Physics, GeologyThe Astronomical Journal
- 2018
Terrestrial Solar System planets either have high mean molecular weight atmospheres, as with Venus, Mars, and Earth, or no atmosphere at all, as with Mercury. We do not have sufficient observational…
The nature of the TRAPPIST-1 exoplanets.
- Geology, Physics
- 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…
Do the TRAPPIST-1 Planets Have Hydrogen-rich Atmospheres?
- Physics, GeologyThe Astrophysical Journal
- 2020
Recently, transmission spectroscopy in the atmospheres of the TRAPPIST-1 planets revealed flat and featureless absorption spectra, which rule out cloud-free hydrogen-dominated atmospheres.…
The 0.8–4.5 μm Broadband Transmission Spectra of TRAPPIST-1 Planets
- Physics, GeologyThe Astronomical Journal
- 2018
The TRAPPIST-1 planetary system represents an exceptional opportunity for the atmospheric characterization of temperate terrestrial exoplanets with the upcoming James Webb Space Telescope (JWST).…
A Review of Possible Planetary Atmospheres in the TRAPPIST-1 System
- Physics, GeologySpace science reviews
- 2020
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.
Polarization of Trappist-1 by the Transit of Its Planets
- Physics, GeologyThe Astrophysical Journal
- 2018
As the first and till date the only one multiple planet hosting dwarf star that is sufficiently cool to form condensate cloud in it atmosphere, Trappist-1 provides unique opportunity to test the…
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