Results 131 to 140 of about 2,941,415 (239)

The evolution of stellar surface activity and possible effects on exoplanets [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractThe evolution of stellar activity involves a complex interplay between the interior dynamo mechanism, the emergent magnetic field configurations and their coupling with stellar winds, the subsequent angular momentum evolution, and fundamental stellar parameters.
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Coupled Planetary Interior and Tidal Evolution

The Astrophysical Journal
We present a new planetary structure/thermal evolution model, designed for use in problems that couple orbital dynamics with planetary structure. We first benchmark our structural/thermal evolution calculations against the MESA stellar evolution code ...
Tim Hallatt, Sarah Millholland
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Interior Evolution of Magma Oceans Exoplanets

The magma ocean (MO) phase typically describes the early stage of rocky planets, during which the entire planet is molten due to heat generated by accretion processes. In the case of short-period exoplanets inside the runaway greenhouse limit, this phase may last Gyrs, until the inventory of major greenhouse gasses, such as H2O and H2, is exhausted ...
Mariana Sastre, Tim Lichtenberg, Harrison Nicholls, Dan Bower, Inga Kamp   +4 more
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Architectures of Exoplanetary Systems. IV. A Multiplanet Model for Reproducing the Radius Valley and Intrasystem Size Similarity of Planets around Kepler’s FGK Dwarfs

The Astrophysical Journal
The Kepler-observed distribution of planet sizes has revealed two distinct patterns: (1) a radius valley separating super-Earths and sub-Neptunes and (2) a preference for intrasystem size similarity.
Matthias Y. He, Eric B. Ford
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EUV influences on exoplanet atmospheric stability and evolution

, 2019
Science white paper submitted to the Astro2020 Decadal Survey.
Youngblood, Allison, France, Kevin, Koskinen, Tommi, Fossati, Luca, Amerstorfer, Ute, Lichtenegger, Herbert, Drake, Jeremy, Mason, James, Fleming, Brian, Allred, Joel, Berta-Thompson, Zachory, Bourrier, Vincent, Froning, Cynthia, Garraffo, Cecilia, Gronoff, Guillaume, Jin, Meng, Kowalski, Adam, Osten, Rachel   +17 more
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Unexpected Near-Resonant and Metastable States of Young Multiplanet Systems

The Astrophysical Journal
Recent observations suggest that the incidence of near-resonant planets declines as planetary systems age, making young planetary systems key signposts of early dynamical evolution.
Zhecheng Hu, Fei Dai, Wei Zhu, Mu-Tian Wang, Max Goldberg, Caleb Lammers, Kento Masuda   +6 more
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Evolution of Exoplanet Detection Techniques

The discovery of exoplanets has transformed modern astrophysics, offering crucial insights  helping  us to understand planetary systems beyond our own. This paper reviews the various methods of exoplanet detection, outlining how these methods have improved and raised our understanding about the characteristics of these exoplanets.
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Far-ultraviolet Flares and Variability of the Young M Dwarf AU Mic: A Nondetection of Planet C in Transit at Lyα

The Astronomical Journal
Atmospheric escape’s potential to shape the exoplanet population motivates detailed observations of systems actively undergoing escape. AU Mic is a young and active M dwarf hosting two close-in transiting sub- to Neptune-sized planets. Atmospheric escape
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood, Girish M. Duvvuri, Emily A. Gilbert, Peter Plavchan, Peter Gao, Hans-R. Müller, Adina D. Feinstein, Thomas Barclay, Eric D. Lopez   +10 more
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Interior and Climate Modeling of the Venus Zone Planet TOI-2285 b

The Astronomical Journal
As the discovery of exoplanets progresses at a rapid pace, the large number of known planets provides a pathway to assess the stellar and planetary properties that govern the climate evolution of terrestrial planets.
Emma L. Miles, Colby Ostberg, Stephen R. Kane, Ondrea Clarkson, Cayman T. Unterborn, Tara Fetherolf, Michael J. Way, Sadie G. Welter   +7 more
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Not All Sub-Neptune Exoplanets Have Magma Oceans

The Astrophysical Journal Letters
The evolution and structure of sub-Neptunes may be strongly influenced by interactions between the outer gaseous envelope of the planet and a surface magma ocean.
Bodie Breza, Matthew C. Nixon, Eliza M.-R. Kempton   +2 more
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