TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol version 1.0doi:10.5194/gmd-13-707-2020Anthony D. Del GenioAvi MandellEric T. WolfFrancois ForgetIan BoutleJun YangKonstantinos TsigaridisMartin TurbetMichael J. Way...
The coupled model is applied to the TRAPPIST-1 planets e and f, assuming different surface conditions and varying amounts of CO$_2$ in the atmosphere. As input for the model we use a constructed spectrum of TRAPPIST-1, based on near-simultaneous data from X-ray to optical wavelengths. ...
TRAPPIST-1e receives about the same amount of light from its star as Earth does from the sun, meaning that if this exoplanet has an atmosphere to retain some of the heat it receives, TRAPPIST-1e would be warm enough for liquid water on its surface. TRAPPIST-1f Lurking on the outer edg...
Even assuming that TRAPPIST-1e had an Earth-like atmosphere, its sky would be a different color owing to the lack of blue light in the spectrum of TRAPPIST-1. This would make the daytime sky appear only about 0.5% bright as it does on the Earth and it would have a distinctly yellow ...
In particular, Wolf investigated planets d, e and f around TRAPPIST-1, which lies about 39 light-years from Earth. He found that planet d orbits too close to its star, building up a thick atmosphere of water vapor that heats the planet even further and boils the rest of the water off...
These planets do not exhibit prominent spectroscopic signatures at near-infrared wavelengths either, which rules out cloud-free hydrogen-dominated atmospheres for TRAPPIST-1 d, e and f, with significance of 8蟽, 6蟽 and 4蟽, respectively. Such an atmosphere is instead not excluded for planet g...
The umber dashed and solid lines were calculated for a 0.01$\%$ and a 5$\%$ water composition, respectively, for irradiation high enough (i.e. for planets b, c and d) that water has fully evaporated in the atmosphere, with the \textbf{U18} interior model \citep{Turbet2020}. The ...
We also show that TRAPPIST-1e is a remarkable candidate\nfor surface habitability. If the planet is today synchronous and abundant in\nwater, then it should always sustain surface liquid water at least in the\nsubstellar region, whatever the atmosphere considered....
Recent JWST observations of the innermost planet TRAPPIST-1b showed that it is most probably a bare rock without any CO2in its atmosphere4. Here we report the detection of thermal emission from the dayside of TRAPPIST-1c with the Mid-Infrared Instrument (MIRI) on JWST at 15m. We measure ...
These measurements are most consistent with re-radiation of the incident flux of the TRAPPIST-1 star from only the dayside hemisphere of the planet. The most straightforward interpretation is that there is little or no planetary atmosphere redistributing radiation from the host star and also no ...