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We give an overview of our current understanding of the structure of gas giant planets, from Jupiter and Saturn to extrasolar giant planets. We focus on addressing what high-pressure laboratory experiments on hydrogen and helium can help to…

Astrophysics · Physics 2008-11-26 Jonathan J. Fortney

In this review, I briefly summarize the present status of experimental and theoretical investigations of the properties of matter under conditions characteristic of planetary interiors, from terrestrial to jovian planets. I first focus on…

Earth and Planetary Astrophysics · Physics 2015-05-14 Gilles Chabrier

We discuss the interior structure and composition of giant planets, and how this structure changes as these planets cool and contract over time. Here we define giant planets as those that have an observable hydrogen-helium envelope, which…

Earth and Planetary Astrophysics · Physics 2009-11-18 Jonathan J. Fortney , Isabelle Baraffe , Burkhard Militzer

Equilibrium properties of hydrogen-helium mixtures under conditions similar to the interior of giant gas planets are studied by means of first principle density functional molecular dynamics simulations. We investigate the molecular and…

Other Condensed Matter · Physics 2009-07-09 Jan Vorberger , I. Tamblyn , B. Militzer , S. A. Bonev

The properties of hydrogen-helium mixtures at high pressure are crucial to address important questions about the interior of Giant planets e.g. whether Jupiter has a rocky core and did it emerge via core accretion? Using path integral Monte…

Materials Science · Physics 2009-11-10 Burkhard Militzer

Equilibrium properties of hydrogen-helium mixtures under thermodynamic conditions found in the interior of giant gas planets are studied by means of density functional theory molecular dynamics simulations. Special emphasis is placed on the…

Materials Science · Physics 2009-09-29 Jan Vorberger , Isaac Tamblyn , Stanimir A. Bonev , Burkhard Militzer

Recent observations of Jupiter and Saturn provided by spacecraft missions, such as Juno and Cassini, compel us to revise and improve our models of giant planet interiors. Even though hydrogen and helium are by far the dominant species in…

Earth and Planetary Astrophysics · Physics 2017-03-30 François Soubiran , Burkhard Militzer , Kevin P. Driver , Shuai Zhang

We briefly examine the properties of dense plasmas characteristic of the interior of giant planets and the atmospheres of neutron stars. Special attention is devoted to the equation of state of hydrogen and helium at high density and to the…

Astrophysics · Physics 2009-11-11 G. Chabrier , D. Saumon , A. Potekhin

In this chapter we summarize current knowledge of the internal structure of giant planets. We concentrate on the importance of heavy elements and their role in determining the planetary composition and internal structure, in planet…

Earth and Planetary Astrophysics · Physics 2019-02-06 Ravit Helled , Tristan Guillot

This article provides an overview of how models of giant planet interiors are constructed. We review measurements from past space missions that provide constraints for the interior structure of Jupiter. We discuss typical three-layer…

Earth and Planetary Astrophysics · Physics 2016-10-19 Burkhard Militzer , Francois Soubiran , Sean M. Wahl , William Hubbard

Probing the interiors of the gas giant planets in our Solar System is not an easy task. It requires a set of accurate measurements combined with theoretical models that are used to infer the planetary composition and its depth dependence.…

Earth and Planetary Astrophysics · Physics 2018-12-19 Ravit Helled

Many planets in the solar system and across the galaxy have hydrogen-rich atmospheres overlying more heavy element-rich interiors with which they interact for billions of years. Atmosphere-interior interactions are thus crucial to…

Earth and Planetary Astrophysics · Physics 2024-07-08 Akash Gupta , Lars Stixrude , Hilke E. Schlichting

The immiscibility of hydrogen-helium mixture under the temperature and pressure conditions of planetary interiors is crucial for understanding the structures of gas giant planets (e.g., Jupiter and Saturn). While the experimental probe at…

Hydrogen, helium, silicates, and iron are key building blocks of rocky and gas-rich planets, yet their chemical interactions remain poorly constrained. Using first-principles molecular dynamics and thermodynamic integration, we quantify…

Earth and Planetary Astrophysics · Physics 2025-10-30 Akash Gupta , Haiyang Luo , Jie Deng , Adam Burrows

We know that giant planets played a crucial role in the making of our Solar System. The discovery of giant planets orbiting other stars is a formidable opportunity to learn more about these objects, what is their composition, how various…

Astrophysics · Physics 2009-11-10 Tristan Guillot

First-principle modeling of dense hydrogen is crucial in materials and planetary sciences. Despite its apparent simplicity, predicting the ionic and electronic structure of hydrogen is a formidable challenge, and it is connected with the…

Earth and Planetary Astrophysics · Physics 2026-05-20 Cesare Cozza , Kousuke Nakano , Saburo Howard , Hao Xie , Ravit Helled , Guglielmo Mazzola

Helium is the second most abundant element in the universe, and together with silica, they are major components of giant planets. Exploring the reactivity and state of helium and silica under high pressure is of fundamental importance for…

The mixing behavior of hydrogen with heavier elements plays a key role in modeling the interiors of giant planets such as Jupiter and Saturn. Using density functional theory combined with molecular dynamics, we investigate hydrogen-neon…

Earth and Planetary Astrophysics · Physics 2026-04-14 Armin Bergermann , Siegfried Glenzer , Arianna Glaeson , Ronald Redmer

Recent developments of dynamic x-ray characterization experiments of dense matter are reviewed, with particular emphasis on conditions relevant to interiors of terrestrial and gas giant planets. These studies include characterization of…

Earth and Planetary Astrophysics · Physics 2015-05-13 J. J. Fortney , S. H. Glenzer , M. Koenig , B. Militzer , D. Saumon , D. Valencia

The core accretion model for giant planet formation suggests a two layer picture for the initial structure of Jovian planets, with heavy elements in a dense core and a thick H-He envelope. Late planetesimal accretion and core erosion could…

Earth and Planetary Astrophysics · Physics 2016-09-21 Francois Soubiran , Burkhard Militzer
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