Results 1 to 10 of about 15,442 (228)
DYNAMICAL MEASUREMENTS OF THE INTERIOR STRUCTURE OF EXOPLANETS [PDF]
The Astrophysical Journal, 2013 Giant gaseous planets often reside on orbits in sufficient proximity to their host stars for the planetary quadrupole gravitational field to become non-negligible. In presence of an additional planetary companion, a precise characterization of the system's orbital state can yield meaningful constraints on the transiting planet's interior structure ...
Juliette C. Becker, Konstantin Batygin
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Machine-learning inference of the interior structure of low-mass exoplanets [PDF]
The Astrophysical Journal, 2020 Abstract We explore the application of machine-learning based on mixture density neural networks (MDNs) to the interior characterization of low-mass exoplanets up to 25 Earth masses constrained by mass, radius, and fluid Love number, k 2. We create a data set of 900,000 synthetic planets, consisting of an iron-rich core,
Philipp Baumeister +6 more
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Early Time Small-scale Structures in Hot Exoplanet Atmosphere Simulations [PDF]
The Astrophysical JournalAbstract We report on the critical influence of small-scale flow structures (e.g., fronts, vortices, and waves) that immediately arise in hot exoplanet atmosphere simulations initialized with a resting state. A hot, 1:1 spin–orbit synchronized Jupiter is used here as a clear example; but, the phenomenon is generic and important for any ...
J. W. Skinner, James Y‐K. Cho
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Enhanced constraints on the interior composition and structure of terrestrial exoplanets [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Exoplanet interior modelling usually makes the assumption that the elemental abundances of a planet are identical to those of its host star. Host stellar abundances are good proxies of planetary abundances, but only for refractory elements. This is particularly true for terrestrial planets, as evidenced by the relative differences in bulk chemical ...
Haiyang Wang +5 more
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The impact of exoplanets' measured parameters on the inferred internal structure. [PDF]
Astronomy & Astrophysics, 2020 Context. Exoplanet characterization is one of the main foci of current exoplanetary science. For super-Earths and sub-Neptunes, we mostly rely on mass and radius measurements, which allow us to derive the mean density of the body and give a rough estimate of the bulk composition of the planet. However, the determination of planetary interiors is a very
Jon Otegi +5 more
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Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy [PDF]
Science, 2014 Exoplanets that orbit close to their host stars are much more highly irradiated than their solar system counterparts. Understanding the thermal structures and appearances of these planets requires investigating how their atmospheres respond to such extreme stellar forcing.
Kevin B. Stevenson +15 more
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Understanding exoplanet formation, structure and evolution in 2010 [PDF]
Proceedings of the International Astronomical Union, 2010 AbstractIn this short review, we summarize our present understanding (and non-understanding) of exoplanet formation, structure and evolution, in the light of the most recent discoveries. Recent observations of transiting massive brown dwarfs seem to remarkably confirm the predicted theoretical mass-radius relationship in this domain.
G. Chabrier +2 more
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Characterising the internal structures of small exoplanets with CHEOPS
, 2022 <p>The successful Kepler and TESS missions have discovered thousands of exoplanets and let the community focus on the characterisation of these bodies. One area of research utilises ultra-high-precision photometric and spectroscopic follow-up observations in order to accurately constrain the bulk densities of terrestrial exoplanets ...
T. G. Wilson
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Revealing Stellar Surface Structure Behind Transiting Exoplanets
, 2018 During exoplanet transits, successive stellar surface portions become hidden and differential spectroscopy between various transit phases provide spectra of small surface segments temporarily hidden behind the planet. Line profile changes across the stellar disk offer diagnostics for hydrodynamic modeling, while exoplanet analyses require stellar ...
Dainis Dravins
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Terrestrial Exoplanet Internal Structure Constraints Enabled by Comprehensive Host Star Characterization Reveal That Terrestrial Planets in Mean Motion Resonances Are Water Rich [PDF]
The Astrophysical JournalExoplanet mass and radius inferences fundamentally rely on host star mass and radius inferences. Despite the importance of host star mass, radius, and elemental abundance inferences for the derivation of exoplanet internal structure constraints ...
Alejandra Ross +4 more
doaj +2 more sources