Results 101 to 110 of about 152,640 (256)

Supplementary data from Atmospheric composition of exoplanets based on the thermal escape of gases and implications for habitability

, 2020
The detection of habitable exoplanets is an exciting scientific and technical challenge. Owing to the current and most likely long-lasting impossibility of performing in situ exploration of exoplanets, their study and hypotheses regarding their capability to host life will be based on the restricted low-resolution spatial and spectral information of ...
Konatham, Samuel, Martin-Torres, Javier, Maria-Paz Zorzano   +2 more
openaire   +1 more source

Tracing the Contribution of Abiotic Methane in Deep Natural Gases From the Songliao Basin, China Using Bulk Isotopes and Methane Clumped Isotopologue 12CH2D2

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The identification and evaluation of abiotic methane remain an active research area due to uncertainties in traditional indicators that may lead to “false‐positive” detections. As an emerging isotopic tool, methane clumped isotope can provide novel information about the generation and post‐generation processes of methane gases.
Jiacheng Li, Qingmei Liu, Wenmin Jiang, Yun Li, Yanhua Shuai, Yongqiang Xiong   +5 more
wiley   +1 more source

Properties of Sub-Neptune Atmospheres: TOI-270 System [PDF]

, 2020
We investigate the potential for the James Webb Space Telescope (JWST) to detect and characterize the atmospheres of the sub-Neptunian exoplanets in the TOI-270 system. Sub-Neptunes are considered more likely to be water worlds than gas dwarfs. We model their atmospheres using three atmospheric compositions - two examples of hydrogen-dominated ...
arxiv   +1 more source

Thermophysical States of MgSiO3 Liquid up to Terapascal Pressures: Implications for Magma Oceans in Super‐Earths and Sub‐Neptunes

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract Thermophysical properties of silicate liquids under extreme conditions are critical for understanding the accretion and evolution of super‐Earths and sub‐Neptunes. The thermal equation of state and viscosity of silicate liquids determine the adiabatic profiles and dynamics of magma oceans. However, these properties are challenging to constrain
Haiyang Luo, Jie Deng
wiley   +1 more source

Clouds and Hazes in GJ 1214 b’s Metal-rich Atmosphere

The Astronomical Journal
The sub-Neptune GJ 1214 b has an infamously flat transmission spectrum, likely due to thick aerosols in its atmosphere. A recent JWST/MIRI spectroscopic phase curve of GJ 1214 b added to this picture, suggesting a highly reflective and metal-rich ...
Isaac Malsky, Emily Rauscher, Kevin Stevenson, Arjun B. Savel, Maria E. Steinrueck, Peter Gao, Eliza M.-R. Kempton, Michael T. Roman, Jacob L. Bean, Michael Zhang, Vivien Parmentier, Anjali A. A. Piette, Tiffany Kataria   +12 more
doaj   +1 more source

Origin and Extent of the Opacity Challenge for Atmospheric Retrievals of WASP-39 b

The Astrophysical Journal Letters, 2023
As the James Webb Space Telescope (JWST) came online last summer, we entered a new era of astronomy. This new era is supported by data products of unprecedented information content that require novel reduction and analysis techniques.
Prajwal Niraula, Julien de Wit, Iouli E. Gordon, Robert J. Hargreaves, Clara Sousa-Silva   +4 more
doaj   +1 more source

On the protection of extrasolar Earth-like planets around K/M stars against galactic cosmic rays

, 2009
Previous studies have shown that extrasolar Earth-like planets in close-in habitable zones around M-stars are weakly protected against galactic cosmic rays (GCRs), leading to a strongly increased particle flux to the top of the planetary atmosphere.
A. Stadelmann, Beaulieu, Belisheva, Buccino, Correia, Crutzen, Fichtner, Fridlund, Goldreich, Grenfell, Grenfell, Grießmeier, Grießmeier, Grießmeier, H. Lammer, Haagen-Smit, Heath, Heber, Holzwarth, Hubbard, J.-M. Grießmeier, J.L. Grenfell, Joshi, Joshi, Kallenrode, Kasting, Khodachenko, Kuchner, Lammer, Lammer, Lestrade, Lovelock, Lovis, Léger, MacDonald, Mann, McDonald, Murray, Parker, Peale, Prölss, Reeves, Ribas, Rivera, Sagan, Scalo, Scherer, Schindler, Selsis, Selsis, Selsis, Seo, Shea, Smart, Smith, Tarter, U. Motschmann, Udry, Valencia, Valencia, Vogt, Voigt, Voigt, Wood, Wood   +64 more
core   +3 more sources

Hydrogen sulfide and metal-enriched atmosphere for a Jupiter-mass exoplanet. [PDF]

Nature
As the closest transiting hot Jupiter to Earth, HD 189733b has been the benchmark planet for atmospheric characterization 1,2,3. It has also been the anchor point for much of our theoretical understanding of exoplanet atmospheres from composition 4 ...
Guangwei Fu, L. Welbanks, D. Deming, J. Inglis, Michael Zhang, J. Lothringer, Jegug Ih, J. Moses, E. Schlawin, H. Knutson, Gregory W. Henry, Thomas P. Greene, David K. Sing, A. Savel, E. Kempton, D. Louie, M. Line, M. Nixon   +17 more
semanticscholar   +1 more source

MESSENGER Observations of a Possible Alfvén Wing at Mercury Driven by a Low Alfvénic Mach Number Interplanetary Coronal Mass Ejection

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract We investigate Mercury's response to rare, low Alfvénic Mach number MA $\left({M}_{A}\right)$ solar wind conditions using observations from the Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) mission. This study provides compelling evidence of Mercury's altered magnetospheric state under these extreme conditions ...
Charles F. Bowers, Caitríona M. Jackman, Xianzhe Jia, James A. Slavin, Joachim Saur, Mika K. G. Holmberg, Ryan M. Dewey, Daniel Heyner, Filip Elekes, Lina Z. Hadid, Benoit Lavraud, Yang Wang, Hans L. F. Huybrighs, Matthew J. Rutala, Alexandra R. Fogg, Stephenie Brophy Lee, Daragh M. Hollman   +16 more
wiley   +1 more source

Patchy Forsterite Clouds in the Atmospheres of Two Highly Variable Exoplanet Analogs

The Astrophysical Journal, 2023
We present an atmospheric retrieval analysis of a pair of highly variable, ∼200 Myr old, early T type planetary-mass exoplanet analogs SIMP J01365662+0933473 and 2MASS J21392676+0220226 using the Brewster retrieval framework.
Johanna M. Vos, Ben Burningham, Jacqueline K. Faherty, Sherelyn Alejandro, Eileen Gonzales, Emily Calamari, Daniella Bardalez Gagliuffi, Channon Visscher, Xianyu Tan, Caroline V. Morley, Mark Marley, Marina E. Gemma, Niall Whiteford, Josefine Gaarn, Grace Park   +14 more
doaj   +1 more source