Results 31 to 40 of about 700 (166)

The Coronal Structure of the Sun-Like Exoplanet-Host GJ 3021 [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractWe present the results of a numerical simulation of the corona and wind structure of the Sun-like exoplanet-host GJ 3021 using a global magnetohydrodynamic (MHD) model. The simulation is driven by the radial component of the surface magnetic field recovered with the Zeeman Doppler Imaging (ZDI) technique.
J. D. Alvarado-Gómez, O. Cohen, G. A. J. Hussain, J. Grunhut, C. Garraffo, J. Drake   +5 more
openaire   +1 more source

Irradiated Atmospheres. IV. Effect of Mixing Heat Flux on Chemistry

The Astrophysical Journal
Vertical mixing disrupts the thermochemical equilibrium and introduces additional heat flux that alters exoplanetary atmospheric temperatures. We investigate how this mixing-induced heat flux affects atmospheric chemistry.
Zhen-Tai Zhang, Wei Zhong, Wei Wang, Jianheng Guo, Xianyu Tan, Bo Ma, Ruyi Wei, Cong Yu   +7 more
doaj   +1 more source

Extracting starspot structures from exoplanet transit photometry

Astronomy & Astrophysics
Context . Future space-based transit photometry can provide empirical comparisons of solar and stellar spot structures with high precision. Spot transit mapping provides a way to directly observe and characterize the location, size, intensity, and evolution of starspots to infer stellar rotation rates and ...
S. M. Zaleski, A. Valio, B. Carter
openaire   +1 more source

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
openaire   +4 more sources

Most Super-Earths Have Less Than 3% Water

The Astrophysical Journal
Super-Earths are highly irradiated, small planets with bulk densities approximately consistent with Earth. We construct combined interior atmosphere models of super-Earths that trace the partitioning of water throughout a planet, including an iron-rich ...
James G. Rogers, Caroline Dorn, Vivasvaan Aditya Raj, Hilke E. Schlichting, Edward D. Young   +4 more
doaj   +1 more source

Characterizing Exoplanets for Assessing Their Potential Habitability

The Astrophysical Journal
The Statistical-likelihood Exoplanetary Habitability Index (SEPHI) serves as a valuable tool for prioritizing targets for further study and identifying potentially habitable environments.
J. M. Rodríguez-Mozos, A. Moya
doaj   +1 more source

Distinguishing Oceans of Water from Magma on Mini-Neptune K2-18b

The Astrophysical Journal Letters
Mildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid-water oceans (“Hycean” planets). The presence of CO _2 and simultaneous absence of ammonia (NH _3 ) in their atmospheres has been proposed as a ...
Oliver Shorttle, Sean Jordan, Harrison Nicholls, Tim Lichtenberg, Dan J. Bower   +4 more
doaj   +1 more source

JWST-TST DREAMS: Nonuniform Dayside Emission for WASP-17b from MIRI/LRS

The Astronomical Journal
We present the first spectroscopic characterization of the dayside atmosphere of WASP-17b in the mid-infrared using a single JWST MIRI/LRS eclipse observation.
Daniel Valentine, Hannah R. Wakeford, Ryan C. Challener, Natasha E. Batalha, Nikole K. Lewis, David Grant, Elijah Mullens, Lili Alderson, Jayesh Goyal, Ryan J. MacDonald, Erin M. May, Sara Seager, Kevin B. Stevenson, Jeff A. Valenti, Natalie H. Allen, Néstor Espinoza, Ana Glidden, Amélie Gressier, Jingcheng Huang, Zifan Lin, Douglas Long, Dana R. Louie, Mark Clampin, Marshall Perrin, Roeland P. van der Marel, C. Matt Mountain   +25 more
doaj   +1 more source

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
openaire   +3 more sources

Constraining Exoplanet Structure and Composition: Linking Theory & Observations

, 2022
Since the discovery of first exoplanet by the end of the twentieth century, technological advancements have hugely extended our understanding of planetary systems. The large number of discovered exoplanets has unveiled a staggering diversity in their nature, leading to the surprising conclusion that our Solar System may not be a typical system.
openaire   +1 more source