Results 71 to 80 of about 20,660,199 (171)
The Linear Mixing Approximation in Silica–Water Mixtures at Planetary Conditions
The Astrophysical JournalThe linear mixing approximation (LMA) is often used in planetary models for calculating the equations of state (EOS) of mixtures. A commonly assumed planetary composition is a mixture of rock and water. Here we assess the accuracy of the LMA for pressure–
Valiantsin Darafeyeu +3 more
doaj +1 more source
Observations and thermochemical modeling of gas and ice giant planets
, 2022 International audienceThe formation of giant planets can mainly be explained by two models: core accretion and gravitational collapse. Measurements of magnetic and gravity fields, as well as deep composition can help to constrain which scenario led to ...
Lunine, Jonathan +7 more
core +1 more source
Flyby-induced Second Accretion as a Pathway to Giant Planets Around M Dwarfs
The Astrophysical Journal LettersClassical pebble and core accretion theories face a severe challenge: they struggle to produce giant planets around low-mass M dwarfs, whose protoplanetary disks contain insufficient material. Yet, discoveries of such systems continue to mount.
Shunjing Zhao +7 more
doaj +1 more source
The Astronomical JournalThe present-day bulk elemental composition of an exoplanet can provide insight into a planet’s formation and evolutionary history. Such information is now being measured for dozens of planets with state-of-the-art facilities using Bayesian atmosphere ...
Joshua D. Lothringer +2 more
doaj +1 more source
The Astrophysical Journal Supplement SeriesThe equation of state of hydrogen–helium (H–He) mixtures plays a vital role in the evolution and structure of gas giant planets and exoplanets. Recent equations of state that account for H–He interactions, coupled with H–He immiscibility curves, can now ...
Roberto Tejada Arevalo +3 more
doaj +1 more source
A Search for Wide-orbit Planets around M Dwarfs Using Deep MIRI 15 μm Images
The Astronomical JournalWide-orbit (>10 au) gas-giant planets shape the architecture of planetary systems, yet their occurrence rate remains poorly constrained. The James Webb Space Telescope (JWST) has obtained the deepest mid-infrared images of nearby stars to date through ...
Yihan Li +9 more
doaj +1 more source
From planetesimals to planets with N-body simulations in the giant-planet formation region
Astronomy & AstrophysicsThe cores of wide-orbit giant planets can form via pebble accretion if large planetesimals form in the outer regions of protoplanetary discs at sufficiently early times.
Lorek Sebastian, Lambrechts Michiel
doaj +1 more source
The Astrophysical JournalContinuing our initiative on advancing the calculations of planetesimal accretion in the core-accretion model, we present here the results of our recent study of the contributions of planetesimals around and beyond the orbit of Saturn.
Nader Haghighipour +2 more
doaj +1 more source
Astronomy & AstrophysicsLate infall can replenish the building materials of planets in protoplanetary disks and dramatically alter their structural evolution. The resulting pressure bumps effectively accumulate dust, facilitate grain coagulation, and trigger planetesimal ...
Zhao Haichen +4 more
doaj +1 more source
A Possible Mechanism to Explain the Prograde Equatorial Jet of a Jupiter-like Gaseous Giant
The Astrophysical Journal LettersGaseous giants are characterized by their deep atmospheres, which lack clear boundaries with their interiors; therefore, their internal states could directly influence atmospheric dynamics. So far, most modeling studies have considered deep convection as
Yuchen Lian, Pengshuo Duan, Dali Kong
doaj +1 more source