TRAPPIST-1 c Archives - Page 3 of 3 - Astrobiology

Oxygen retention efficiency as a function of initial water content in TO. Top Row: Interior planets, T1-b, c, and d. Bottom Row: Outer planets, T1-e, f, g, and h. Coloring shows the percentage of simulations at a particular initial water content that fell in a given oxygen retention efficiency bin (e.g., each column corresponds to one initial water content and sums to 100%). Contours are given for the 50th percentile values (solid white lines) and the 1σ confidence region (dashed white lines). -- astro-ph.EP

Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report, TRAPPIST-1

The Implications of Thermal Hydrodynamic Atmospheric Escape on the TRAPPIST-1 Planets

by Keith CowingMay 7, 2024May 7, 2024

JWST observations of the 7-planet TRAPPIST-1 system will provide an excellent opportunity to test outcomes of stellar-driven evolution of terrestrial planetary atmospheres, including atmospheric escape, ocean loss and abiotic oxygen […]

Comparing TRAPPIST-1 planets to Solar System planets (left) and likely rocky exoplanets already observed or planned to be observed by JWST in Cycle 1 and 2 (right). Incident flux is plotted against escape velocity, so that planets in the top left are less likely to retain atmospheres, and planets in the bottom right are more likely to retain atmospheres. Stellar temperature, represented by color, may also play a role in atmosphere retention. Black Xs are placed on the labeled exoplanets which have already been observed to have no thick atmosphere. The gray line in the right panel is the “cosmic shoreline” (Finc ∝ vesc 4 ) presented in Zahnle & Catling (2017). -- astro-ph.EP

Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report, TRAPPIST-1

The Carbon-Deficient Evolution Of TRAPPIST-1c

by Keith CowingNovember 29, 2023November 29, 2023

Transiting planets orbiting M dwarfs provide the best opportunity to study the atmospheres of rocky planets with current facilities.

Water cloud horizontal and vertical distributions. Water cloud column (a) in latitude vs longitude coordinates and (b) tidallylocked coordinates (b). Water cloud content vertical distribution (c) as a function of tidally-locked latitude (averaged over all tidallylocked longitudes). The plots were computed for an initially hot and steamy 2 R⊕ planet (with a 10 bar of H2O + 1 bar of N2 atmosphere) synchronously rotating (fixed rotation period of 60 Earth days) around a M3 star, and forced to an ISR of 500 W m−2 (simulation M3-YANG-1). The outputs were averaged over 250 Earth days. For reference, insolation is 340.5 W m−2 on present-day Earth. Wind fields are superimposed on the plots. Winds are plotted at a pressure of ∼ 50 Pa in panels a and b, and averaged over all tidally-locked (TL) longitudes in panel c. -- astro-ph.EP

Astrochemistry, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Status Report, TRAPPIST-1, Water/Hycean Worlds & Oceanography

Water Condensation Zones Around Main Sequence Stars

by Keith CowingAugust 29, 2023August 29, 2023

Understanding the set of conditions that allow rocky planets to have liquid water on their surface — in the form of lakes, seas or oceans — is a major scientific […]

Brightness temperature spectra for the dayside hemisphere of selected modeled environments for TRAPPIST-1 c with JWST with points corresponding to the model spectra convolved to the F1500W filter band, over the full-wide half-max of the band’s wavelength extent (horizontal error bars). We also show the data point measured by Zieba et al. (2023), along with lines corresponding to blackbody temperatures for day-side with zero heat redistribution (dark grey dashed) and for a blackbody with perfect heat redistribution (light gray dashed). The best fit atmospheres are the 0.1 bar, O2-dominated atmospheres, at 0.5–1.0σ from the measured eclipse depth. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Habitable Zones, Imaging & Spectroscopy, Status Report, TRAPPIST-1

Potential Atmospheric Compositions of TRAPPIST-1 c constrained by JWST/MIRI Observations At 15 μm

by Keith CowingAugust 14, 2023August 14, 2023

The first JWST observations of TRAPPIST-1 c showed a secondary eclipse depth of 421+/-94 ppm at 15 um, which is consistent with a bare rock surface or a thin, O2-dominated, […]

Rocky exoplanet TRAPPIST-1 c artist's concept.

Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release, TRAPPIST-1

Webb Rules Out Thick Carbon Dioxide Atmosphere for Rocky Exoplanet TRAPPIST-1 c

by Keith CowingJune 19, 2023June 19, 2023

An international team of researchers has used NASA’s James Webb Space Telescope to calculate the amount of heat energy coming from the rocky exoplanet TRAPPIST-1 c. The result suggests that […]

Simulated emission spectra of TRAPPIST-1 c with MIRI photometric filter mean fluxes for water and CO2 atmospheres, obtained with the high-resolution, k-correlated MSEIRADTRAN model. Color boxes indicate the wavelength ranges of the different filters. — astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, TRAPPIST-1

Interior-atmosphere Modelling To Assess The Observability Of Rocky Planets With JWST

by Keith CowingMay 3, 2023May 3, 2023

Super-Earths present compositions dominated by refractory materials. However, there is a degeneracy in their interior structure between a planet with no atmosphere and a small Fe content, and a planet […]