99 citations · 279 across the 6 of their papers we have counts for
6 papers
The Case and Context for Atmospheric Methane as an Exoplanet Biosignature
Maggie A. Thompson, Joshua Krissansen-Totton, Nicholas Wogan +2
Methane has been proposed as an exoplanet biosignature. Imminent observations with the James Webb Space Telescope may enable methane detections on potentially habitable exoplanets,…
Waterworlds Probably Do Not Experience Magmatic Outgassing
Joshua Krissansen-Totton, Max L. Galloway, Nicholas Wogan +2
Terrestrial planets with large water inventories are likely ubiquitous and will be among the first Earth-sized planets to be characterized with upcoming telescopes. It has previous…
Oxygen False Positives on Habitable Zone Planets Around Sun-Like Stars
Joshua Krissansen-Totton, Jonathan J. Fortney, Francis Nimmo +1
Oxygen is a promising exoplanet biosignature due to the evolutionary advantage conferred by harnessing starlight for photosynthesis, and the apparent low likelihood of maintaining…
Abundant atmospheric methane from volcanism on terrestrial planets is unlikely and strengthens the case for methane as a biosignature
Nicholas Wogan, Joshua Krissansen-Totton, David C. Catling
The disequilibrium combination of abundant methane and carbon dioxide has been proposed as a promising exoplanet biosignature that is readily detectable with upcoming telescopes su…
Creation and Evolution of Impact-generated Reduced Atmospheres of Early Earth
Kevin Zahnle, Roxana Lupu, David Catling +1
The origin of life on Earth seems to demand a highly reduced early atmosphere, rich in CH4, H2, and NH3, but geological evidence suggests that Earth's mantle has always been relati…
When is chemical disequilibrium in Earth-like planetary atmospheres a biosignature versus an anti-biosignature? Disequilibria from dead to living worlds
Nicholas Wogan, David Catling
Chemical disequilibrium in exoplanetary atmospheres (detectable with remote spectroscopy) can indicate life. The modern Earth's atmosphere-ocean system has a much larger chemical d…