Results 1 to 10 of about 71 (70)

Magma Ocean Evolution at Arbitrary Redox State. [PDF]

J Geophys Res Planets
Abstract Interactions between magma oceans and overlying atmospheres on young rocky planets leads to an evolving feedback of outgassing, greenhouse forcing, and mantle melt fraction. Previous studies have predominantly focused on the solidification of oxidized Earth‐similar planets, but the diversity in mean density and irradiation observed in the low ...
Nicholls H, Lichtenberg T, Bower DJ, Pierrehumbert R.   +3 more
europepmc   +2 more sources

The sulfur species in hot rocky exoplanet atmospheres

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract The first JWST observations of hot Jupiters showed an unexpected detection of SO2$$ {}_2 $$ in their hydrogen‐rich atmospheres. We investigate how much sulfur can be expected in the atmospheres of rocky exoplanets and which sulfur molecules can be expected to be most abundant and detectable by transmission spectroscopy.
L. J. Janssen, P. Woitke, O. Herbort, M. Min, K. L. Chubb, Ch. Helling, L. Carone   +6 more
wiley   +1 more source

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape from Mars

Journal of Geophysical Research: Space Physics, Volume 128, Issue 10, October 2023., 2023
Abstract We apply a recently proposed method to estimate heavy ion escape from Mars. The method combines in situ observations with a hybrid plasma model, which treats ions as particles and electrons as a fluid. With this method, we investigate how solar upstream conditions, including solar extreme ultraviolet (EUV) radiation, solar wind dynamic ...
Qi Zhang, Mats Holmström, Xiao‐dong Wang, Hans Nilsson, Stas Barabash   +4 more
wiley   +1 more source

3D Climate Simulations of the Archean Find That Methane has a Strong Cooling Effect at High Concentrations

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 6, 27 March 2023., 2023
Abstract Methane is thought to have been an important greenhouse gas during the Archean, although its potential warming has been found to be limited at high concentrations due to its high shortwave absorption. We use the Met Office Unified Model, a general circulation model, to further explore the climatic effect of different Archean methane ...
J. K. Eager‐Nash, N. J. Mayne, A. E. Nicholson, J. E. Prins, O. C. F. Young, S. J. Daines, D. E. Sergeev, F. H. Lambert, J. Manners, I. A. Boutle, E. T. Wolf, I. E. E. Kamp, K. Kohary, T. M. Lenton   +13 more
wiley   +1 more source

Enhanced Ion Escape Rate During IMF Rotation Under Weak Intrinsic Magnetic Field Conditions on a Mars‐Like Planet

Journal of Geophysical Research: Space Physics, Volume 128, Issue 3, March 2023., 2023
Abstract The rotation of the interplanetary magnetic field (IMF) provides details of the escape mechanism that varies with the interaction between the intrinsic magnetic field and the IMF. A multispecies magnetohydrodynamic simulation is conducted on a Mars‐like planet under the conditions of a weak intrinsic magnetic field and the IMF rotating by 180°
Shotaro Sakai, Kanako Seki, Naoki Terada, Hiroyuki Shinagawa, Ryoya Sakata, Takashi Tanaka, Yusuke Ebihara   +6 more
wiley   +1 more source

Growth and Evolution of Secondary Volcanic Atmospheres: 2. The Importance of Kinetics

Journal of Geophysical Research: Planets, Volume 128, Issue 3, March 2023., 2023
Abstract Volcanism is a major and long‐term source of volatile elements such as C and H to Earth's atmosphere, likely has been to Venus's atmosphere, and may be for exoplanets. Models simulating volcanic growth of atmospheres often make one of two assumptions: either that atmospheric speciation is set by the high‐temperature equilibrium of volcanism or
Philippa Liggins, Sean Jordan, Paul B. Rimmer, Oliver Shorttle   +3 more
wiley   +1 more source

In Search of Subsurface Oceans Within the Uranian Moons

Journal of Geophysical Research: Planets, Volume 126, Issue 12, December 2021., 2021
Abstract The Galileo mission to Jupiter discovered magnetic signatures associated with hidden subsurface oceans at the moons Europa and Callisto using the phenomenon of magnetic induction. These induced magnetic fields originate from electrically conductive layers within the moons and are driven by Jupiter's strong time‐varying magnetic field.
C. J. Cochrane, S. D. Vance, T. A. Nordheim, M. J. Styczinski, A. Masters, L. H. Regoli   +5 more
wiley   +1 more source

Identifying the possibilities and pitfalls of conducting IUCN Red List assessments from remotely sensed habitat information based on insights from poorly known Cuban mammals

Conservation Biology, Volume 35, Issue 5, Page 1598-1614, October 2021., 2021
Abstract The International Union for Conservation of Nature's Red List of Threatened Species (RLS) is the key global tool for objective, repeatable assessment of species’ extinction risk status, and plays an essential role in tracking biodiversity loss and guiding conservation action.
Clare Duncan, Monika Böhm, Samuel T. Turvey   +2 more
wiley   +1 more source

Oxygen False Positives on Habitable Zone Planets Around Sun‐Like Stars

AGU Advances, Volume 2, Issue 2, June 2021., 2021
Abstract Oxygen is a promising exoplanet biosignature due to the evolutionary advantage conferred by harnessing starlight for photosynthesis, and the apparent low likelihood of maintaining oxygen‐rich atmospheres without life. Hypothetical scenarios have been proposed for non‐biological oxygen accumulation on planets around late M‐dwarfs, where the ...
Joshua Krissansen‐Totton, Jonathan J. Fortney, Francis Nimmo, Nicholas Wogan   +3 more
wiley   +1 more source

Aerosols in Exoplanet Atmospheres

Journal of Geophysical Research: Planets, Volume 126, Issue 4, April 2021., 2021
Abstract Observations of exoplanet atmospheres have shown that aerosols, like in the solar system, are common across a variety of temperatures and planet types. The formation and distribution of these aerosols are inextricably intertwined with the composition and thermal structure of the atmosphere.
Peter Gao, Hannah R. Wakeford, Sarah E. Moran, Vivien Parmentier   +3 more
wiley   +1 more source