A5079704238- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Geomagnetism and Paleomagnetism Studies
- Climate variability and models
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- Complex Systems and Time Series Analysis
California Institute of Technology
2022-2024
Brandeis University
2022-2024
Queen Mary University of London
2019-2022
Abstract We present a comprehensive analysis of the Hubble Space Telescope observations atmosphere WASP-121 b, an ultra-hot Jupiter. After reducing transit, eclipse, and phase-curve with uniform methodology addressing biases from instrument systematics, sophisticated atmospheric retrievals are used to extract robust constraints on thermal structure, chemistry, cloud properties atmosphere. Our shows that consistent strong inversion beginning at ∼10 4 Pa dayside, solar subsolar metallicity Z...
Abstract Population studies of exoplanets are key to unlocking their statistical properties. So far, the inferred properties have been mostly limited planetary, orbital, and stellar parameters extracted from, e.g., Kepler, radial velocity, Gaia data. More recently an increasing number exoplanet atmospheres observed in detail from space ground. Generally, however, these atmospheric focused on individual planets, with exception a couple works that detected presence water vapor clouds...
ABSTRACT The goal of this white paper is to provide a snapshot the data availability and needs primarily for Ariel space mission, but also related atmospheric studies exoplanets cool stars. It covers following data-related topics: molecular atomic line lists, profiles, computed cross-sections opacities, collision-induced absorption other continuum data, optical properties aerosols surfaces, chemistry, UV photodissociation photoabsorption cross-sections, standards in description format such...
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 clear example; but, phenomenon generic important for any type planet—gaseous, oceanic, or telluric. When early time are not captured (due to, e.g., poor resolution and/or too much dissipation), behavior markedly different at...
Abstract Observations of hot-Jupiter atmospheres show large variations in the location “hot spot” and amplitude spectral features. Atmospheric flow simulations using commonly employed forcing initialization have generally produced a large, monolithic patch nearly stationary hot area located eastward substellar point at high altitude. Here we perform high-resolution (T682) pseudospectral that accurately capture small-scale eddies waves inherent due to ageostrophy. The contain number intense...
We investigate modons on tidally synchronised extrasolar planets. Modons are highly dynamic, coherent flow structures composed of a pair storms with opposite signs vorticity. They important because they divert flows the large-scale; and, powered by intense irradiation from host star, planetary-scale sized and exhibit quasi-periodic life-cycles -- chaotically moving around planet, breaking reforming many times over long durations (e.g. thousands planet days). Additionally, transport mix...
ABSTRACT We perform an extensive study of numerical convergence for hot-Jupiter atmospheric flow solutions in simulations employing a setup commonly used extrasolar planet studies – resting state thermally forced to prescribed temperature distribution on short time-scale at high altitudes. Convergence is assessed rigorously with (i) highly accurate pseudospectral model that has been explicitly verified well under conditions and (ii) comparisons the kinetic energy spectra, instantaneous...
Abstract We analyze the structure and dynamics of plasma atmospheres Coulomb-liquid oceans on neutron stars. Salient dynamical parameters are identified their values estimated for governing set magnetohydrodynamics equations. Neutron star strongly stratified and, depending rotation period, contain a multitude long-lived vortices (spots) and/or narrow zonal jets (free-shear zones) in large plasma-beta regime—i.e., β p ≫ 1 (hydrodynamic regime). In contrast, when ≲ (magnetohydrodynamic...
Most current models of hot-exoplanet atmospheres assume shallow heating, a strong day-night differential heating near the top atmosphere. Here we investigate effects energy deposition at differing depths in model tidally locked gas-giant exoplanet. We perform high-resolution atmospheric flow simulations forced with idealized thermal representative and deep (i.e., stellar irradiation strongly deposited ∼103 Pa ∼105 pressure levels, respectively). Unlike exhibits new dynamic equilibrium state,...
We present a comprehensive analysis of the Hubble Space Telescope observations atmosphere WASP-121 b, ultra-hot Jupiter. After reducing transit, eclipse, and phase-curve with uniform methodology addressing biases from instrument systematics, sophisticated atmospheric retrievals are used to extract robust constraints on thermal structure, chemistry, cloud properties atmosphere. Our shows that consistent strong inversion beginning at ~0.1 bar dayside, solar subsolar metallicity Z (i.e., -0.77...
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 clear example; but, phenomenon generic important for any type hot planet--gaseous, oceanic, or telluric. When early-time are not captured (due to, e.g., poor resolution and/or too much dissipation), behavior markedly different at later...
Observations of hot-Jupiter atmospheres show large variations in the location hot spot and amplitude spectral features. Atmospheric flow simulations using commonly-employed forcing initialization have generally produced a large, monolithic patch stationary area located eastward substellar point at $\sim 3\!\times\! 10^{-3}$ MPa pressure level. Here we perform high-resolution (up to T682) pseudospectral that accurately capture small-scale eddies waves, inherent due ageostrophy. The contain...
We analyze the structure and dynamics of plasma atmospheres Coulomb-liquid oceans on neutron stars. Salient dynamical parameters are identified their values estimated for governing set magnetohydrodynamics equations. Neutron star strongly stratified and, depending rotation period, contain a multitude long-lived vortices (spots) and/or narrow zonal jets (free-shear zones) in large plasma-beta regime-i.e., $\beta_p \gg 1$ (hydrodynamic regime). In contrast, when \lesssim (magnetohydrodynamic...
We review the recent progress in understanding jet structures on exoplanets as well and inside Sun. The emphasis is more robust aspects of observation numerical modeling that relate directly to jets. For exoplanets, primary focus hot-Jupiters since many observations are available for them presently than other types exoplanets. Because not much known about morphology strength jets there currently agreement. In contrast, picture very different fact, structure Sun arguably one best all planets...
Most current models of hot-exoplanet atmospheres assume shallow heating, a strong day-night differential heating near the top atmosphere. Here we investigate effects energy deposition at differing depths in model tidally locked gas-giant exoplanet. We perform high-resolution atmospheric flow simulations forced with idealized thermal representative and deep (i.e., stellar irradiation strongly deposited ∼10^{3} Pa ∼10^{5} pressure levels, respectively). Unlike exhibits new dynamic equilibrium...