169 citations · 561 across the 11 of their papers we have counts for
8 papers · 1 filter
A Maximum Subsurface Biomass on Mars from Untapped Free Energy: CO and H2 as Potential Antibiosignatures
Steven F. Sholes, Joshua Krissansen-Totton, David C. Catling
Whether extant life exists in the martian subsurface is an open question. High concentrations of photochemically produced CO and H2 in the otherwise oxidizing martian atmosphere re…
Strange messenger: A new history of hydrogen on Earth, as told by Xenon
Kevin J. Zahnle, Marko Gacesa, David C. Catling
Atmospheric xenon is strongly mass fractionated, the result of a process that apparently continued through the Archean and perhaps beyond. Previous models that explain Xe fractiona…
Detectability of biosignatures in anoxic atmospheres with the James Webb Space Telescope: A TRAPPIST-1e case study
Joshua Krissansen-Totton, Ryan Garland, Patrick Irwin +1
The James Webb Space Telescope (JWST) may be capable of finding biogenic gases in the atmospheres of habitable exoplanets around low mass stars. Considerable attention has been giv…
Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model
Joshua Krissansen-Totton, Giada N. Arney, David C. Catling
The early Earth's environment is controversial. Climatic estimates range from hot to glacial, and inferred marine pH spans strongly alkaline to acidic. Better understanding of earl…
Consequences of Giant Impacts on Early Uranus for Rotation, Internal Structure, Debris, and Atmospheric Erosion
J. A. Kegerreis, L. F. A. Teodoro, V. R. Eke +6
We perform a suite of smoothed particle hydrodynamics simulations to investigate in detail the results of a giant impact on the young Uranus. We study the internal structure, rotat…
Geoscience and the Search for Life Beyond the Solar System
Rory Barnes, Anat Shahar, Cayman Unterborn +11
How can scientists conclude with high confidence that an exoplanet hosts life? As telescopes come on line over the next 20 years that can directly observe photons from terrestrial…