Results 11 to 20 of about 33,632 (191)

EUV influences on exoplanet atmospheric stability and evolution [PDF]

, 2019
The planetary effective surface temperature alone is insufficient to characterize exoplanet atmospheres and their stability or evolution. Considering the star-planet system as a whole is necessary, and a critical component of the system is the photoionizing stellar extreme ultraviolet emission (EUV; 100-912 ).
Allison Youngblood, Tommi Koskinen, L. Fossati, Ute Amerstorfer, Herbert Lichtenegger, J. J. Drake, James Mason, Brian Fleming, Joel C. Allred, Zachory K. Berta-Thompson, V. Bourrier, Cynthia S. Froning, Cecilia Garraffo, Guillaume Gronoff, Meng Jin, Adam F. Kowalski, Rachel A. Osten, Osten, Rachel   +17 more
openalex   +3 more sources

Coupling the Atmospheric and Dynamical Evolution of Close-in Exoplanets

, 2021
The vast majority of the detected exoplanets orbit in less than a month around their star, in extreme conditions unmet in the Solar System. The demographics of these close-in planets exhibit a striking feature: the lack of Neptune-size worlds on very short orbits, also dubbed the "Neptunian desert", which challenges our understanding of planetary ...
O. Attia, V. Bourrier
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Atmospheric mass-loss and evolution of short-period exoplanets: the examples of CoRoT-7b and Kepler-10b [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
Short-period exoplanets potentially lose envelope masses during their evolution because of atmospheric escape caused by the intense XUV radiation from their host stars. We develop a combined model of atmospheric mass loss calculation and thermal evolution calculation of a planet to simulate its evolution and explore the dependences on the formation ...
Hiroyuki Kurokawa, Lisa Kaltenegger
openalex   +3 more sources

Biological, Equilibrium and Photochemical Signatures of C, N and S Isotopes in the Early Earth and Exoplanet Atmospheres. [PDF]

Life (Basel)
The unambiguous detection of biosignatures in exoplanet atmospheres is a primary objective for astrobiologists and exoplanet astronomers. The primary methodology is the observation of combinations of gases considered unlikely to coexist in an atmosphere ...
Lyons JR.
europepmc   +2 more sources

Atmospheric Studies of brown-Dwarfs and Exoplanets: Insights into Planet Formation and Evolution

, 2018
Cette thèse se focalise sur les propriétés atmosphériques des exoplanètes et des naines brunes et le lien avec les mécanismes de formation. Dans la première partie, le ratio des abondances de carbone et d'oxygène (C/O) du compagnon et de son étoile hôte est utilisé comme proxy.
B. Lavie
openalex   +3 more sources

EXODUS: A mission to explore exoplanet evolution through understanding atmospheric escape

EXODUS is a proposed mission to study the largely unexplored range of sub-Neptune to Jupiter-sized exoplanets with orbital periods longer than 100 days. The focus of the mission lies in the detection of these planets and characterisation of atmospheric escape to constrain their evolutionary pathways.
Citlali Bruce Rosete, Mireia Leon-Dasi, Marius Anger, Paula Benitez Sesmilo, Mark R. Boyd, Frederik Dall'Omo, Simone Filomeno, Jan‐Vincent Harre, K. Angelique Kahle, Isabel Pitz, Vito Saggese, Vito Saggese   +11 more
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Thermal structure, composition, atmospheric dynamics and long-terme evolution of irradiated exoplanets

, 2014
More than a thousand exoplanets have been discovered over the last decade. Perhaps more excitingly, probing their atmospheres has become possible. We now have spectra of hot Jupiters like HD 189733b and HD 209458b, of Neptune-like planets like GJ1214b and even smaller planets are within reach.
Vivien Parmentier
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Modelling the effect of stellar metallicity on the XUV evolution of low-mass stars and its impact on exoplanet atmospheres/habitability

Monthly Notices of the Royal Astronomical Society
ABSTRACT Understanding how exoplanet atmospheres evolve is a key question in the context of habitability. One key process governing this evolution is atmospheric evaporation by stellar X-ray and EUV (extreme ultraviolet) emission (collectively, XUV).
Victor See, Charlotte Fairman, Louis Amard, Oliver Hall   +3 more
openaire   +3 more sources

Metal-enriched Atmospheres in Warm (Super- and Sub-) Neptunes Induced by Extreme Atmospheric Escape

The Astrophysical Journal
Planet formation impacts exoplanet atmospheres by accreting metals in solid form, leading to atmospheric carbon-to-oxygen ratios (C/O) and sulfur-to-nitrogen ratios (S/N) that deviate from those of their host stars. Recent observations indicate differing
Amy J. Louca, Yamila Miguel
doaj   +2 more sources

Effects of Ultraviolet Radiation on Sub-Neptune Exoplanet Hazes through Laboratory Experiments

The Planetary Science Journal
Temperate sub-Neptune exoplanets could contain large inventories of water in various phases, such as water worlds with water-rich atmospheres or even oceans.
Lori Huseby, Sarah E. Moran, Neil Pearson, Tiffany Kataria, Chao He, Cara Pesciotta, Sarah M. Hörst, Pierre Haenecour, Travis Barman, Vishnu Reddy, Nikole K. Lewis, Véronique Vuitton   +11 more
doaj   +2 more sources