Magnetically Controlled Circulation on Hot Extrasolar Planets
arXiv:1307.8038 · doi:10.1088/0004-637X/776/1/53
Abstract
Through the process of thermal ionization, intense stellar irradiation renders Hot Jupiter atmospheres electrically conductive. Simultaneously, lateral variability in the irradiation drives the global circulation with peak wind speeds of order ~ km/s. In turn, the interactions between the atmospheric flows and the background magnetic field give rise to Lorentz forces that can act to perturb the flow away from its purely hydrodynamical counterpart. Using analytical theory and numerical simulations, here we show that significant deviations away from axisymmetric circulation are unstable in presence of a non-negligible axisymmetric magnetic field. Specifically, our results suggest that dayside-to-nightside flows, often obtained within the context of three-dimensional circulation models, only exist on objects with anomalously low magnetic fields, while the majority of highly irradiated exoplanetary atmospheres are entirely dominated by zonal jets.
arXiv comment15 pages, 6 figures, accepted to ApJ
References in corpus (40)
- Detection of Planetary Transits Across a Sun-like Star
- Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
- The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
- Detection of Thermal Emission from an Extrasolar Planet
- Atmospheric Circulation and Tides of "51Peg b-like" Planets
- Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b
- A Temperature and Abundance Retrieval Method for Exoplanet Atmospheres
- The 3.6-8.0 Micron Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion
- Equatorial superrotation on tidally locked exoplanets
- Evolution of "51Peg b-like" Planets
- Possible Solutions to the Radius Anomalies of Transiting Giant Planets
- Can TiO Explain Thermal Inversions in the Upper Atmospheres of Irradiated Giant Planets?
- Inflating Hot Jupiters With Ohmic Dissipation
- Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands
- Atmospheric circulation of tidally locked exoplanets: a suite of benchmark tests for dynamical solvers
- Dynamic Meteorology at the Photosphere of HD 209458b
- A Time-Dependent Radiative Model of HD209458b
- Constraints on Deep-seated Zonal Winds Inside Jupiter and Saturn
- Changing Face of the Extrasolar Giant Planet, HD 209458b
- A ground-based near-infrared emission spectrum of the exoplanet HD 189733b
- Magnetic Drag on Hot Jupiter Atmospheric Winds
- Atmospheric Circulation of Hot Jupiters: A Shallow Three-Dimensional Model
- Three-Dimensional Atmospheric Circulation Models of HD 189733b and HD 209458b with Consistent Magnetic Drag and Ohmic Dissipation
- A General Circulation Model for Gaseous Exoplanets with Double-Gray Radiative Transfer
- Atmospheric Dynamics of Short-period Extra Solar Gas Giant Planets I: Dependence of Night-Side Temperature on Opacity
- Information Content of Exoplanetary Transit Spectra: An Initial Look
- Evolution of Ohmically Heated Hot Jupiters
- Magnetic Scaling Laws for the Atmospheres of Hot Giant Exoplanets
- Atmospheric circulation of tidally locked exoplanets: II. Dual-band radiative transfer and convective adjustment
- Detection of a Temperature Inversion in the Broadband Infrared Emission Spectrum of TrES-4
- Three-dimensional atmospheric circulation of hot Jupiters on highly eccentric orbits
- The CORALIE survey for southern extrasolar planets V: 3 new extrasolar planets
- Hydrodynamic Simulations of Unevenly Irradiated Jovian Planets
- Elliptical instability in terrestrial planets and moons
- Atmospheric circulation of hot Jupiters: insensitivity to initial conditions
- Looking for a Pulse: A search for Rotationally Modulated Radio Emission from the Hot Jupiter, Tau Bootis b
- Observational Consequences of Hydrodynamic Flows on Hot Jupiters
- The Influence of Atmospheric Scattering and Absorption on Ohmic Dissipation in Hot Jupiters
- Radiation-Hydrodynamics of Hot Jupiter Atmospheres
- Thermo-Resistive Instability of Hot Planetary Atmospheres
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