A common mass scaling for satellite systems of gaseous planets
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Summary
This summary is machine-generated.Giant planets in our Solar System have moon systems with a puzzlingly small mass fraction. A new model shows this is regulated by a balance between material supply and gas-driven orbital decay.
Area Of Science
- Planetary Science
- Astrophysics
- Solar System Formation
Background
- Outer planets (Jupiter, Saturn, Uranus) possess multiple moons.
- These moon systems represent a consistent, small fraction (approx. 10^-4) of their host planet's mass.
- This low mass fraction is significantly smaller than that of the Moon relative to Earth and has been a long-standing puzzle.
Purpose Of The Study
- To model the formation and evolution of satellite systems around gas giant planets.
- To explain the observed mass fraction of moon systems around outer Solar System planets.
- To investigate the processes regulating satellite growth and loss during planet formation.
Main Methods
- Developed a numerical model simulating satellite growth and loss.
- Incorporated the accumulation of gas and solids by a forming giant planet.
- Analyzed the interplay between material supply to satellites and orbital decay driven by the circumplanetary gas disk.
Main Results
- The model successfully reproduces the observed mass fraction (approx. 10^-4) of satellite systems for Jupiter, Saturn, and Uranus.
- A balance between inflowing material supply and gas-driven satellite orbital decay regulates this mass fraction.
- The model suggests that these processes naturally lead to the observed properties of the giant planets' moon systems.
Conclusions
- The common, low mass fraction of giant planet satellite systems is a natural outcome of formation processes.
- Competing processes of satellite accretion and gas-driven orbital decay are key regulators.
- Similar mechanisms may limit the size of moons around extrasolar gas giant planets.