stagnant-lid planet Archives - Astrobiology

Transmission spectra for the biotic scenarios. We show the JWST/NIRSpec range between 3 – 5 micron with a continuous grey cloud deck at the p = 0.01 bar (solid lines) and the dry biotic scenarios 1 & 2 with a lower cloud deck at the p = 0.1 bar (dashed line). The inlay for the 3.2 – 3.35 micron range highlights the O3 (grey box) and CH4 feature (magenta box). We further simulated JWST observations with PANDEXO for the dry biotic scenarios 1 & 2 with the lower cloud deck, simulating 100 transit observations of TRAPPIST-1e (black error bars). We chose the G395M grism setting and combined 10 pixels in one bin. -- astro-ph.EP

Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Origin & Evolution of Life, Status Report

The Effect of a Biosphere on the Habitable Timespan of Stagnant-lid Planets and Implications for the Atmospheric Spectrum

by Keith CowingDecember 18, 2024December 19, 2024

Temperature-dependent biological productivity controls silicate weathering and thereby extends the potential habitable timespan of Earth.

Effect of relative luminosity, S/S⊕, on simulated steady-state atmospheres (pCO2 , temperature). A Terrestrial exoplanets in the mobile-lid (ML) interior convection regime. B Terrestrial exoplanets in the stagnant-lid (SL) regime. C,D Distributions of simulations across a discretized range of S/S⊕. -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Imaging & Spectroscopy, Mars, Press Release, Venus, Water/Hycean Worlds & Oceanography

Interior Convection Regime, Host Star Luminosity, And Predicted Atmospheric CO2 Abundance In Terrestrial Exoplanets

by Keith CowingJune 26, 2024June 26, 2024

Terrestrial planets in the Habitable Zone of Sun-like stars are priority targets for detection and observation by the next generation of powerful space telescopes.

States of a stagnant-lid Earth

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Press Release, Water/Hycean Worlds & Oceanography

Redox State And Interior Structure Control On The Long-term Habitability Of Stagnant-lid Planets

by Keith CowingJanuary 10, 2023January 10, 2023

A major goal in the search for extraterrestrial life is the detection of liquid water on the surface of exoplanets.