TRAPPIST 1-f Archives - Page 2 of 2 - Astrobiology

Stellar flares observed in JWST/NIRISS time-series spectroscopy of TRAPPIST-1. Each column shows one flare event during transits of the TRAPPIST-1c or TRAPPIST-1f planets. Tow row: Light curves with the total flux (integrated over the full spectral range and normalized to the mean out-of-transit flux). Colored points indicate pre-flare (green), flare (orange), maximum flare light (red), and post-flare (blue) phases. Green and blue dashed lines mark the average pre- and post-flare flux levels. Middle row: Light curves of the normalized Hα flux. Bottom row: Time-resolved spectrograms (wavelength vs. time) normalized to the pre-flare spectrum. The shaded blue region shows the drop in flux caused by the planetary transit. For comparison, the time axis in all panels are aligned such that t = 0 corresponds to the beginning of the maximum flare light phase. In all four events, the total flux in the post-flare phase is systematically elevated relative to the pre-flare level. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Press Release, Radiation, Space Weather & Heliophysics, TRAPPIST-1

Flares On TRAPPIST-1 Reveal The Spectrum Of Magnetic Features On Its Surface

by Keith CowingAugust 8, 2025August 8, 2025

TRAPPIST-1 is an M8 dwarf hosting seven known exoplanets and is currently one of the most frequently observed targets of the James Webb Space Telescope (JWST).

Habitable Exoplanet - NASA

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Icy Worlds, Mapping, Geodesy, Cartography, Bathymetry, Status Report, TRAPPIST-1, Water/Hycean Worlds & Oceanography

Characterizing Exoplanets For Assessing Their Potential Habitability

by Keith CowingJune 27, 2025June 27, 2025

The Statistical-likelihood Exoplanetary Habitability Index (SEPHI) serves as a valuable tool for prioritizing targets for further study and identifying potentially habitable environments.

This schematic depicts the set-up of the volatile exchange during initialization (t=0) and run time. For initialization, a surface temperature of 4000 K and a completely molten magma ocean is assumed, where the dissolved volatiles are in balance with the outgassed volatile content, set by the volatile melt fraction Fi . As the magma ocean solidifies, part of the volatile budget is deposited in the solid mantle. Further, atmospheric escape can remove H2O. These two sink terms thus reduce the amount of a volatile available in the fully coupled magma ocean-atmosphere system Mmoa i . The full overview of all included processes, including radiogenic heating, is shown in Barth et al. (2021, Fig. 1) -- astro-ph.EP

Astrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Lava / magma ocean / Volcanic Worlds, Press Release, TRAPPIST-1

From CO2- to H2O-dominated Atmospheres And Back — How Mixed Outgassing Changes The Volatile Distribution In Magma Oceans Around M Dwarf Stars [TRAPPIST-1]

by Keith CowingMay 24, 2025May 24, 2025

We investigate the impact of CO2 on TRAPPIST-1 e, f and g during the magma ocean stage. These potentially habitable rocky planets are currently the most accessible for astronomical observations.

Left, difference in wmf between two different hydrosphere assumptions and the default model. Red dotted is models with the surface temperature raised to create a layer of liquid water instead of ice Ih. Blue dashed is models with the AQUA compilation of EoSs from Haldemann et al. (2020). The hatched region shows the 1-σ region of wmf from observational uncertainties with our default model. Right, difference in wmf between planet models with different bulk moduli for the mantle or core and our default planet model. In red, the bulk modulus of the core is increased (dotted) and decreased (dashed) by 10%. In blue, the bulk modulus of the bridgmanite and post perovskite is increased/decreased by 10%. -- astro-ph.EP

Astrogeology, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Status Report, TRAPPIST-1

Uncertainties In The Inference of Internal Structure: The Case of TRAPPIST-1 f

by Keith CowingApril 24, 2025April 24, 2025

We use the TRAPPIST-1 system as a model observation of Earth-like planets. The densities of these planets being 1-10% less than the Earth suggest that the outer planets may host […]

This schematic depicts the set-up of the volatile exchange during initialization (t=0) and run time. For initialization, a surface temperature of 4000 K and a completely molten magma ocean is assumed, where the dissolved volatiles are in balance with the outgassed volatile content, set by the volatile melt fraction Fi . As the magma ocean solidifies, part of the volatile budget is deposited in the solid mantle. Further, atmospheric escape can remove H2O. These two sink terms thus reduce the amount of a volatile available in the fully coupled magma ocean-atmosphere system Mimoa . The full overview of all included processes, including radiogenic heating, is shown in Barth et al. (2021, Fig. 1) -- astro-ph.EP

Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Lava / magma ocean / Volcanic Worlds, Status Report

How Mixed Outgassing Changes The Volatile Distribution In Magma Oceans Around M Dwarf Stars

by Keith CowingDecember 17, 2024December 17, 2024

We investigate the impact of CO2 on TRAPPIST-1 e, f and g during the magma ocean stage. These potentially habitable rocky planets are currently the most accessible for astronomical observations.

Quiescent stellar spectrum (blue), superflare peak spectrum (green; blackbody with 9000 K), and total spectrum (black) scaled to the orbit of TRAPPIST-1 𝑒. The Kepler transmission curve is shown in red, and the relevant UV ranges as gray shaded areas. -- MNRAS

Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics, Status Report, TRAPPIST-1

An Experimental Study Of The Biological Impact Of A Superflare On The TRAPPIST-1 Planets

by Keith CowingNovember 8, 2024November 8, 2024

In the present study, we conducted experiments to assess the biological effects of high fluences of UV radiation (UVR) on the TRAPPIST-1 planetary system (planets e, f, g within the […]

Astrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release, SETI & Technosignatures, Terraforming & Geoengineering, TRAPPIST-1

Telltale Greenhouse Gases Could Signal Alien Terraforming Activity

by Keith CowingJune 26, 2024June 26, 2024

If aliens modified a planet in their solar system to make it warmer, we’d be able to tell. A new UC Riverside study identifies the artificial greenhouse gases that would […]