Results 11 to 20 of about 517 (155)

TEMPERATURE STRUCTURE AND ATMOSPHERIC CIRCULATION OF DRY TIDALLY LOCKED ROCKY EXOPLANETS [PDF]

The Astrophysical Journal, 2016
ABSTRACT Next-generation space telescopes will observe the atmospheres of rocky planets orbiting nearby M-dwarfs. Understanding these observations will require well-developed theory in addition to numerical simulations. Here we present theoretical models for the temperature structure and atmospheric circulation of dry, tidally locked ...
Daniel D. B. Koll, Dorian S. Abbot
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The effects of magnetic fields on observational signatures of atmospheric escape in exoplanets: Double tail structures

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACTUsing 3D radiative MHD simulations and Lyman-α transit calculations, we investigate the effect of magnetic fields on the observational signatures of atmospheric escape in exoplanets. Using the same stellar wind, we vary the planet’s dipole field strength (Bp) from 0 to 10G.
S Carolan, A A Vidotto, G Hazra, C Villarreal D’Angelo, D Kubyshkina   +4 more
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Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) [PDF]

Astronomy & Astrophysics, 2020
Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres. In this context, we present the analysis of new optical spectroscopy for the transiting ultra-hot Jupiter WASP-121b.
Bourrier, V., Ehrenreich, D., Lendl, M., Cretignier, M., Allart, R., Dumusque, X., Cegla, H,. M., Surez, -Mascareo, A., Wyttenbach, A., Hoeijmakers, H.J., Melo, C., Kuntzer, T., Astudillo, -Defru, N., Giles, H., Heng, K., Kitzmann, D., Lavie, B., Lovis, C., Murgas, F., Nascimbeni, V., Pepe, F., Pino, L., Segransan, D., Udry, S.   +23 more
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THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS [PDF]

The Astrophysical Journal, 2016
ABSTRACT By varying the profiles of stellar extreme ultraviolet (EUV) spectral energy distributions (SEDs), we tested the influences of stellar EUV SEDs on the physical and chemical properties of an escaping atmosphere. We apply our model to study four exoplanets: HD 189733b, HD 209458b, GJ 436b, and Kepler-11b.
Guo, J. H., Ben-Jaffel, Lotfi
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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.
Stevenson, K. B., Desert, J.-M., Line, Michael R., Bean, J. L., Fortney, Jonathan J., Showman, A. P., Kataria, T., Kreidberg, Laura, McCullough, Peter R., Henry, Gregory W., Charbonneau, D., Burrows, A., Madhusudhan, Nikku, Williamson, M. H., Homeier, Derek, Seager, Sara   +15 more
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Temperature Structures Associated with Different Components of the Atmospheric Circulation on Tidally Locked Exoplanets

The Astrophysical Journal, 2022
Abstract Observations of time-resolved thermal emission from tidally locked exoplanets can tell us about their atmospheric temperature structure. Telescopes such as JWST and ARIEL will improve the quality and availability of these measurements.
Neil T. Lewis, Mark Hammond
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Towards a Theory for the Atmospheres, Structure, and Evolution of Giant Exoplanets [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractIn this short review, I summarize some of the salient features of the emerging theory of exoplanets in general, and of giant exoplanets in particular. A focus is on the characterization of transiting planets at primary and secondary eclipse, but various other related topics are covered, if only briefly.
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ATMOSPHERE EXPANSION AND MASS LOSS OF CLOSE-ORBIT GIANT EXOPLANETS HEATED BY STELLAR XUV. II. EFFECTS OF PLANETARY MAGNETIC FIELD; STRUCTURING OF INNER MAGNETOSPHERE [PDF]

The Astrophysical Journal, 2015
This is the second paper in a series where we build a self-consistent model to simulate the mass-loss process of a close-orbit magnetized giant exoplanet, so-called hot Jupiter (HJ). In this paper we generalize the hydrodynamic (HD) model of an HJ expanding hydrogen atmosphere, proposed in the first paper, to include the effects of intrinsic planetary ...
M. L. Khodachenko, I. F. Shaikhislamov, H. Lammer, P. A. Prokopov   +3 more
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Early Time Small-scale Structures in Hot Exoplanet Atmosphere Simulations

The Astrophysical Journal
Abstract 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, J. Y-K. Cho
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Sub-Neptunes Are Drier than They Seem: Rethinking the Origins of Water-rich Worlds

The Astrophysical Journal Letters
Recent claims of biosignature gases in sub-Neptune atmospheres have renewed interest in water-rich sub-Neptunes with surface oceans, often referred to as Hycean planets. These planets are hypothesized to form beyond the snow line, accreting large amounts
Aaron Werlen, Caroline Dorn, Remo Burn, Hilke E. Schlichting, Simon L. Grimm, Edward D. Young   +5 more
doaj   +1 more source