Results 11 to 20 of about 120 (106)

CO₂ Ocean Bistability on Terrestrial Exoplanets. [PDF]

J Geophys Res Planets, 2022
Abstract Cycling of carbon dioxide between the atmosphere and interior of rocky planets can stabilize global climate and enable planetary surface temperatures above freezing over geologic time. However, variations in global carbon budget and unstable feedback cycles between planetary sub‐systems may destabilize the climate of rocky exoplanets toward ...
Graham RJ, Lichtenberg T, Pierrehumbert RT.   +2 more
europepmc   +2 more sources

Water Dynamics in Highly Concentrated Salt Solutions: A Multi-Nuclear NMR Approach. [PDF]

ChemistryOpen, 2022
A multi‐nuclear NMR approach including quadrupolar nuclei is used to monitor water and ions mobility in a series of saturated salt solutions. It is shown that water can preserve a high degree of mobility inside such solutions. The results shed light on water dynamics in highly crowded environments such as phase‐separated cellular compartments enriched ...
Rezaei-Ghaleh N.
europepmc   +2 more sources

The harsh environment where exoplanets live

Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022
Abstract The X‐ray and Extreme Ultraviolet (XUV) actvity of the Sun has determined important effects on the planets around it. In particular, high doses of X‐rays, flares, and coronal mass ejections (CMEs) combined with masses and sizes of the planets and the shielding action of the planetary magnetic fields have determined the diverse habitability of ...
Ignazio Pillitteri
wiley   +1 more source

X-Ray-luminous Supernovae: Threats to Terrestrial Biospheres

The Astrophysical Journal, 2023
The spectacular outbursts of energy associated with supernovae (SNe) have long motivated research into their potentially hazardous effects on Earth and analogous environments.
Ian R. Brunton, Connor O’Mahoney, Brian D. Fields, Adrian L. Melott, Brian C. Thomas   +4 more
doaj   +1 more source

Hot Jupiters: Origins, Structure, Atmospheres

Journal of Geophysical Research: Planets, Volume 126, Issue 3, March 2021., 2021
Abstract We provide a brief review of many aspects of the planetary physics of hot Jupiters. Our aim is to cover most of the major areas of current study while providing the reader with additional references for more detailed follow‐up. We first discuss giant planet formation and subsequent orbital evolution via disk‐driven torques or dynamical ...
Jonathan J. Fortney, Rebekah I. Dawson, Thaddeus D. Komacek   +2 more
wiley   +1 more source

Vertically Resolved Magma Ocean–Protoatmosphere Evolution: H2, H2O, CO2, CH4, CO, O2, and N2 as Primary Absorbers

Journal of Geophysical Research: Planets, Volume 126, Issue 2, February 2021., 2021
Abstract The earliest atmospheres of rocky planets originate from extensive volatile release during magma ocean epochs that occur during assembly of the planet. These establish the initial distribution of the major volatile elements between different chemical reservoirs that subsequently evolve via geological cycles.
Tim Lichtenberg, Dan J. Bower, Mark Hammond, Ryan Boukrouche, Patrick Sanan, Shang‐Min Tsai, Raymond T. Pierrehumbert   +6 more
wiley   +1 more source

Multiverse Predictions for Habitability: Number of Potentially Habitable Planets

Universe, 2019
How good is our universe at making habitable planets? The answer to this depends on which factors are important for life: Does a planet need to be Earth mass? Does it need to be inside the temperate zone? are systems with hot Jupiters habitable? Here, we
McCullen Sandora
doaj   +1 more source

Oceans, Lakes, and Stromatolites on Mars

Advances in Astronomy, Volume 2020, Issue 1, 2020., 2020
Billions of years ago, the Northern Hemisphere of Mars may have been covered by at least one ocean and thousands of lakes and rivers. These findings, based initially on telescopic observations and images by the Mariner and Viking missions, led investigators to hypothesize that stromatolite fashioning cyanobacteria may have proliferated in the surface ...
Rhawn G. Joseph, Olivier Planchon, N. S. Duxbury, K. Latif, G. J. Kidron, L. Consorti, R. A. Armstrong, C. Gibson, R. Schild, Michael Kueppers   +9 more
wiley   +1 more source

Ion‐Scale Characteristics of the Martian Magnetic Pile‐Up Boundary Layer

Geophysical Research Letters, Volume 52, Issue 3, 16 February 2025.
Abstract The Martian magnetic pile‐up boundary (MPB) delineates the interface between the magnetosheath and the induced magnetosphere, but its global ion‐scale characteristics remaining unclear. Utilizing a three‐dimensional Hall magnetohydrodynamic (MHD) model, this study aims to reveal the features of the MPB layer, including magnetic field, current ...
Shibang Li, Siqi Wang, Haoyu Lu, Jinbin Cao, Xiaoshu Wu, Yasong Ge, James A. Wild, Chuanfei Dong, Nihan Chen, Yihui Song, Jianxuan Wang, Yuchen Cao, Jianing Zhao   +12 more
wiley   +1 more source

Evolution of Stellar Activity and Habitable Zone. I. Ultraviolet Emission of Dwarfs in Open Clusters and Field Stars

The Astrophysical Journal Supplement Series
Near-ultraviolet (NUV) radiation from dwarf stars plays a critical role in shaping the habitability of planetary systems, yet its long-term evolution across different spectral types remains poorly investigated.
Xue Li, Song Wang, Jun Ma, Henggeng Han, Yang Huang, Jifeng Liu   +5 more
doaj   +1 more source