The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI) is a community project that aims to quantify how dfferences in general circulation models (GCMs) could impact the climate prediction for TRAPPIST-1e and, subsequently […]
TRAPPIST-1
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Non-detection Of Helium In The Upper Atmospheres Of TRAPPIST-1b, e and f
We obtained high-resolution spectra of the ultra-cool M-dwarf TRAPPIST-1 during the transit of its planet `b’ using two high dispersion near-infrared spectrographs, IRD instrument on the Subaru 8.2m telescope and […]
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Water Ice Cloud Variability & Multi-Epoch Transmission Spectra of TRAPPIST-1e
The precise characterization of terrestrial atmospheres with the James Webb Space Telescope (JWST) is one of the utmost goals of exoplanet astronomy in the next decade. With JWST’s impending launch, […]
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The Seven Rocky Planets Of TRAPPIST-1 Seem To Have Very Similar Compositions
A new international study led by astrophysicist Eric Agol from the University of Washington has measured the densities of the seven planets of the exoplanetary system TRAPPIST-1 with extreme precision, […]
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Characterisation Of The Hydrospheres Of TRAPPIST-1 Planets
Context. Planetary mass and radius data are showing a wide variety in densities of low-mass exoplanets. This includes sub-Neptunes, whose low densities can be explained with the presence of a […]
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Phase Modeling of the TRAPPIST-1 Planetary Atmospheres
Transiting compact multi-planet systems provide many unique opportunities to characterize the planets, including studies of size distributions, mean densities, orbital dynamics, and atmospheric compositions. The relatively short orbital periods in […]
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The Effect Of Land Albedo On The Climate Of Land-Dominated Planets In The TRAPPIST-1 System
Variations in the reflective properties of the bulk material that comprises the surface of land-dominated planets will affect the planetary energy balance by interacting differently with incident radiation from the […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Press Release, TRAPPIST-1
Can A Multi-layer Planet Be Approximated As A Homogeneous Planet?
With the discovery of TRAPPIST-1 and its seven planets within 0.06 au, the correct treatment of tidal interactions is becoming necessary. The eccentricity, rotation, and obliquity of the planets of […]
Posted inPress Release, TRAPPIST-1
Refining The Transit Timing And Photometric Analysis Of TRAPPIST-1: Masses, Radii, Densities, Dynamics, And Ephemerides
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 […]
Posted inPress Release, TRAPPIST-1
Surface And Oceanic Habitability Of Trappist-1 Planets Under The Impact Of Flares
The discovery of potentially habitable planets around the ultracool dwarf star Trappist-1 naturally poses the question: could Trappist-1 planets be home to life? These planets orbit very close to the […]