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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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A primordial origin for misalignments between stellar spin axes and planetary orbits.
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA. kbatygin@gps.caltech.edu
Nature
|November 16, 2012
Summary
Planetary migration can explain hot Jupiters, but observed misaligned orbits challenge this. Disk migration in binary systems naturally produces these misaligned planetary orbits, aligning with stellar multiplicity rates.
Area of Science:
- Exoplanetary Science
- Stellar Astrophysics
- Planetary Dynamics
Background:
- Hot Jupiters are gas giants orbiting close to their stars, often explained by planetary migration in protoplanetary disks.
- Observations reveal many hot Jupiters have orbits misaligned with their host stars' spin axes, questioning standard migration models.
Purpose of the Study:
- To investigate how planetary migration can produce misaligned orbits for close-in giant planets.
- To reconcile the observed misalignment of hot Jupiters with planetary formation theories.
Main Methods:
- Simulating idealized protoplanetary disks under gravitational perturbations from distant massive bodies in binary systems.
- Analyzing the dynamical evolution of disk-stellar interactions and their impact on orbital alignment.
Main Results:
- Gravitational torques from dynamical disk evolution in binary systems naturally lead to misalignment between the disk's orbital plane and the host star's spin axis.
- This mechanism explains the observed fraction of misaligned planetary systems, including hot Neptunes and super-Earths.
Conclusions:
- Disk migration in binary systems provides a viable mechanism for generating misaligned hot Jupiter orbits.
- The fraction of misaligned planetary systems is linked to the rate of primordial stellar multiplicity, especially without strong stellar-planetary coupling or dissipation.
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