A5011784854- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Scientific Research and Discoveries
- Geological and Geochemical Analysis
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- History and Developments in Astronomy
- Inertial Sensor and Navigation
- Historical Astronomy and Related Studies
- Solar and Space Plasma Dynamics
- Nuclear physics research studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Isotope Analysis in Ecology
- Atomic and Molecular Physics
- Historical and Architectural Studies
- Methane Hydrates and Related Phenomena
University of California, Berkeley
2013-2022
Planetary Science Institute
2013-2022
The Juno spacecraft has measured Jupiter's low-order, even gravitational moments, $J_2$--$J_8$, to an unprecedented precision, providing important constraints on the density profile and core mass of planet. Here we report a selection interior models based ab initio computer simulations hydrogen-helium mixtures. We demonstrate that dilute core, expanded significant fraction planet's radius, is helpful in reconciling calculated $J_n$ with Juno's observations. Although model predictions are...
The interior structure of Saturn, the depth its winds, and mass age rings constrain formation evolution. In final phase Cassini mission, spacecraft dived between planet innermost ring, at altitudes 2600 to 3900 kilometers above cloud tops. During six these crossings, a radio link with Earth was monitored determine gravitational field rings. We find that Saturn's gravity deviates from theoretical expectations requires differential rotation atmosphere extending least 9000 kilometers. total is...
This article provides an overview of how models giant planet interiors are constructed. We review measurements from past space missions that provide constraints for the interior structure Jupiter. discuss typical three-layer consist a dense central core and inner metallic outer molecular hydrogen-helium layer. These rely heavily on experiments, analytical theory, first-principle computer simulations hydrogen helium to understand their behavior up extreme pressures ~10 Mbar temperatures...
Abstract The Juno spacecraft measured Jupiter’s gravity field and determined the even odd zonal harmonics, J n , with unprecedented precision. However, interpreting these observations has been a challenge because it is difficult to reconcile unexpectedly small magnitudes of moments 4 6 conventional interior models that assume large, distinct core rock ice. Here we show entire set harmonics can be matched an ab initio equation state, wind profiles, dilute heavy elements are distributed as far...
The formation of the giant planets in our solar system, and likely a majority exoplanets, is most commonly explained by accretion nebular hydrogen helium onto large core terrestrial-like composition. fate this has important consequences for evolution interior structure planet. It recently been shown that H2O, MgO, SiO2 dissolve liquid metallic at high temperature pressure. In study, we perform ab initio calculations to study solubility an innermost core. We find dissolution iron be strongly...
The Cassini spacecraft's Grand Finale orbits provided a unique opportunity to probe Saturn's gravity field and interior structure. Doppler measurements yielded unexpectedly large values for the harmonics J_6, J_8, J_10 that cannot be matched with planetary models assume uniform rotation. Instead we present suite of planet's rotates on cylinders, which allows us match all observed even harmonics. For every model, is calculated self-consistently high precision using Concentric Maclaurin...
ABSTRACT In anticipation of improved observational data for Jupiter’s gravitational field, from the Juno spacecraft, we predict static tidal response a variety Jupiter interior models based on ab initio computer simulations hydrogen–helium mixtures. We calculate hydrostatic-equilibrium gravity terms, using non-perturbative concentric Maclaurin Spheroid method that eliminates lengthy expansions used in theory figures. Our captures terms arising coupled and rotational perturbations, which find...
Abstract The close‐by orbits of the ongoing Juno mission allow measuring with unprecedented accuracy Jupiter's low‐degree even gravity moments J 2 , 4 6 and 8 . These can be used to better determine internal density profile constrain its core mass. Yet largest unknown on these comes from effect differential rotation, which gives a degree freedom unaccounted for by structure models. Here considering wide range possible flow structures dynamical considerations, we provide upper bounds dynamics...
We study the response of hot Jupiters to a static tidal perturbation using Concentric MacLaurin Spheroid (CMS) method. For strongly irradiated planets, we first performed radiative transfer calculations relate planet's equilibrium temperature, T_eq, its interior entropy. then determined gravity harmonics, shape, moment inertia, and Love numbers for range two-layer models that assume rocky core plus homogeneous isentropic envelope composed hydrogen, helium, heavier elements. identify general...
An observation of Jupiter's tidal response is anticipated for the on-going Juno spacecraft mission. We combine self-consistent, numerical models equilibrium with observed Doppler shifts from gravity science experiment to test sensitivity tides raised by Galilean satellites and Sun. The concentric Maclaurin spheroid (CMS) method finds shape field a rotating, liquid planet tide satellite, expanded in Love numbers ($k_{nm}$). present improvements CMS theory that eliminate an unphysical center...
In anticipation of improved observational data for Jupiter's gravitational field from the Juno spacecraft, we predict static tidal response a variety Jupiter interior models based on ab initio computer simulations hydrogen-helium mixtures. We calculate hydrostatic-equilibrium gravity terms using non-perturbative concentric Maclaurin Spheroid (CMS) method that eliminates lengthy expansions used in theory figures. Our captures arising coupled and rotational perturbations, which find to be...