318 citations · 3.5k across the 33 of their papers we have counts for
34 papers
Noble Gas Planetology and the Xenon Clouds of Uranus
Kevin J Zahnle
Noble gases provide tracers of cosmic provenance that are accessible to a future Uranus Atmospheric Probe. Argon and krypton are expected to be well-mixed on Uranus with respect to…
Impact Rates in the Outer Solar System
David Nesvorny, Luke Dones, Mario De Pra +2
Previous studies of cometary impacts in the outer Solar System used the spatial distribution of ecliptic comets (ECs) from dynamical models that assumed ECs began on low-inclinatio…
Origin of Life Molecules in the Atmosphere After Big Impacts on the Early Earth
Nicholas F. Wogan, David C. Catling, Kevin J. Zahnle +1
The origin of life on Earth would benefit from a prebiotic atmosphere that produced nitriles, like HCN, which enable ribonucleotide synthesis. However, geochemical evidence suggest…
Revealing the Mysteries of Venus: The DAVINCI Mission
James B. Garvin, Stephanie A. Getty, Giada N. Arney +36
The Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) mission described herein has been selected for flight to Venus as part of the NASA Discover…
Anoxic Atmospheres on Mars Driven by Volcanism: Implications for Past Environments and Life
Steven F. Sholes, Megan L. Smith, Mark W. Claire +2
Mars today has no active volcanism and its atmosphere is oxidizing, dominated by the photochemistry of CO2 and H2O. Using a one-dimensional photochemical model, we consider whether…
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…