Results 21 to 30 of about 40,892 (232)

Constraining stellar rotation and planetary atmospheric evolution of a dozen systems hosting sub-Neptunes and super-Earths [PDF]

open access: yesAstronomy & Astrophysics, 2021
Context. Planetary atmospheric evolution modelling is a prime tool for understanding the observed exoplanet population and constraining formation and migration mechanisms, but it can also be used to study the evolution of the activity level of planet ...
A. Bonfanti   +3 more
semanticscholar   +1 more source

How to Identify Exoplanet Surfaces Using Atmospheric Trace Species in Hydrogen-dominated Atmospheres [PDF]

open access: yesAstrophysical Journal, 2021
Sub-Neptunes (R p ∼ 1.25–4 R Earth) remain the most commonly detected exoplanets to date. However, it remains difficult for observations to tell whether these intermediate-sized exoplanets have surfaces and where their surfaces are located.
Xinting 婷 Yu 余馨   +3 more
semanticscholar   +1 more source

Stellar rotation and its connection to the evolution of hydrogen‐dominated atmospheres of exoplanets [PDF]

open access: yesAstronomische Nachrichten, 2021
AbstractThe population of known low‐ to intermediate‐mass exoplanets shows a large spread in densities, which is believed to be due to the diversity of planetary atmospheres and thus controlled by planetary atmospheric mass loss. One of the main drivers of long‐term atmospheric escape is the absorption of high‐energy X‐ray + extreme ultraviolet (XUV ...
Daria Kubyshkina, Daria Kubyshkina
openaire   +4 more sources

Early Release Science of the exoplanet WASP-39b with JWST NIRSpec G395H [PDF]

open access: yesNature, 2022
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking the formation and evolution of exoplanetary systems^ 1 , 2 .
L. Alderson   +91 more
semanticscholar   +1 more source

A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates

open access: yesGeophysical Monograph Series, Page 47-54., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky   +2 more
wiley  

+2 more sources

True Polar Wander of Lava Worlds

open access: yesThe Astrophysical Journal Letters, 2023
As one of the most detectable types of terrestrial planets, lava worlds are highly prioritized targets for exoplanet atmosphere characterization since their atmospheres may reveal what they are made of and how.
Wanying Kang, Francis Nimmo, Feng Ding
doaj   +1 more source

Evolution of the Exoplanet Size Distribution: Forming Large Super-Earths Over Billions of Years [PDF]

open access: yesAstronomical Journal, 2020
The radius valley, a bifurcation in the size distribution of small, close-in exoplanets, is hypothesized to be a signature of planetary atmospheric loss. Such an evolutionary phenomenon should depend on the age of the star–planet system. In this work, we
T. David   +10 more
semanticscholar   +1 more source

The influence of bulk composition on the long-term interior-atmosphere evolution of terrestrial exoplanets [PDF]

open access: yesAstronomy & Astrophysics, 2020
Aims.The secondary atmospheres of terrestrial planets form and evolve as a consequence of interaction with the interior over geological time. We aim to quantify the influence of planetary bulk composition on the interior–atmosphere evolution for Earth-sized terrestrial planets to aid in the interpretation of future observations of terrestrial exoplanet
Maxim D. Ballmer   +5 more
openaire   +6 more sources

Conclusive Evidence for a Population of Water Worlds around M Dwarfs Remains Elusive

open access: yesThe Astrophysical Journal Letters, 2023
The population of small, close-in exoplanets is bifurcated into super-Earths and sub-Neptunes. We calculate physically motivated mass–radius relations for sub-Neptunes, with rocky cores and H/He-dominated atmospheres, accounting for their thermal ...
James G. Rogers   +2 more
doaj   +1 more source

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