Trappist-1c Archives

Constraints on high mean molecular weight atmosphere compositions for TRAPPIST-1 c. Top panel: Combined visit 1+2 spectrum of TRAPPIST-1 c corrected by the best-fitting stellar contamination model (black points), and atmosphere models for deep 100 bar atmospheres composed of 100% H2O (blue), NH3 (green), CO (red), and CH4 (orange). Bottom panels: Marginalized posterior distributions on the effective surface pressure for different atmosphere compositions (labelled, with colours corresponding to the models in the top panel) The shaded areas correspond to the 1, 2, and 3σ upper limits obtained on the effective surface pressure in each composition scenario. 1-bar atmospheres (indicated by the dashed vertical lines) are ruled out at better than 2-σ for H2O, NH3, and CO-rich compositions. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Imaging & Spectroscopy, Status Report, TRAPPIST-1

Promise and Peril: Stellar Contamination and Strict Limits on the Atmosphere Composition of TRAPPIST-1c from JWST NIRISS Transmission Spectra

by Keith CowingOctober 3, 2024October 3, 2024

Attempts to probe the atmospheres of rocky planets around M dwarfs present both promise and peril. While their favorable planet-to-star radius ratios enable searches for even thin secondary atmospheres, their […]

All Trappist-1e model outputs consistent with an airless Trappist-1b and c, and with initial volatile endowments constrained by the airlessness of the inner planets. Since Trappist-1e orbits beyond the runaway greenhouse limit during the main sequence evolution of Trappist-1, the potential for substantial atmospheric erosion is limited, as most model runs in Monte Carlo simulations retain substantial surface volatile inventories. -- astro-ph.EP

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

Implications Of Atmospheric Non-detections For Trappist-1 Inner Planets on Atmospheric Retention Prospects For Outer Planets

by Keith CowingJune 9, 2023June 9, 2023

JWST secondary eclipse observations of Trappist-1b seemingly disfavor atmospheres >~1 bar since heat redistribution is expected to yield dayside emission temperature below the ~500 K observed.

Trappist-1c

Promise and Peril: Stellar Contamination and Strict Limits on the Atmosphere Composition of TRAPPIST-1c from JWST NIRISS Transmission Spectra

Implications Of Atmospheric Non-detections For Trappist-1 Inner Planets on Atmospheric Retention Prospects For Outer Planets

Survival and Detectability of Mars-Derived Organic Carbon in Phobos Regolith: A Quantitative Hardness Taxonomy for MMX Sample Analysis

Lava World Recon: Juno Studies Io’s Volcanoes

New Exomoon Detection Challenges Cosmic Labels

Discrimination of Tectonic, Swarm And Impact-related Marsquakes Using Spectral Characteristics

Mapping Alien Continents: Achieving Optical VLBI For Exoplanet Imaging