Origin of the Structure of the Kuiper Belt During a Dynamical Instability in the Orbits of Uranus an...
This presentation is the property of its rightful owner.
Sponsored Links
1 / 44

Nathan Kaib 5/16/08 PowerPoint PPT Presentation


  • 86 Views
  • Uploaded on
  • Presentation posted in: General

Origin of the Structure of the Kuiper Belt During a Dynamical Instability in the Orbits of Uranus and Neptune (“the Nice Model”). Levison, H., Morbidelli, A., VanLaerhoven, C., Gomes, R., & Tsiganis, K. Icarus, Accepted. Nathan Kaib 5/16/08. Outline. Description of Kuiper Belt

Download Presentation

Nathan Kaib 5/16/08

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Origin of the Structure of the Kuiper Belt During a Dynamical Instability in the Orbits of Uranus and Neptune (“the Nice Model”)

Levison, H., Morbidelli, A., VanLaerhoven, C., Gomes, R., & Tsiganis, K.

Icarus, Accepted

Nathan Kaib

5/16/08


Outline

  • Description of Kuiper Belt

  • Giant Planet Migration and the Nice Model

  • Simulation Results

  • Conclusions


Outline

  • Description of Kuiper Belt

  • Giant Planet Migration and the Nice Model

  • Simulation Results

  • Conclusions


Properties of the Kuiper Belt

  • Missing Mass: KB only contains 0.01 – 0.1 Earth masses

  • Need 2-3 orders of magnitude more mass to accrete 100-1000 km bodies


Properties of the Kuiper Belt

  • 10 – 50% of objects found in resonances with Neptune

  • Inclinations extend up to ~40o


Properties of the Kuiper Belt

  • Contains large population of excited orbits that do not pass near planets now

    • - Scattered Disk


Properties of the Kuiper Belt

  • Contains double peaked inclination distribution:

    • “Hot” population

    • “Cold” population

Hot

Cold


Properties of the Kuiper Belt

  • Hot and Cold populations have different properties

Hot

Bluer, Larger

Redder, Smaller

Cold


Properties of the Kuiper Belt

  • Cold, low e population has sharp cutoff at 1:2 resonance with Neptune


Outline

  • Description of Kuiper Belt

  • Giant Planet Migration and the Nice Model

  • Simulation Results

  • Conclusions


Planetesimal Scattering


Outer Planet Migration

N

  • Nep, Ura, and Sat much more likely to scatter bodies in than eject them

  • Jupiter’s energy kicks are powerful enough to eject most bodies

J

U

S


Outer Planet Migration

Neptune, Uranus, and Saturn migrate outwards and Jupiter moves in to conserve angular momentum


Current Planet Configuration

1:2 MMR

Saturn currently is ~1.3 AU beyond the 1:2 MMR with Jupiter


The Nice Model

1:2 MMR

~35 AU

If there were 10’s of Earth masses of material beyond Neptune originally, then Saturn must have crossed the 1:2 MMR with Jupiter


  • Saturn crossing 1:2 MMR causes orbits of U and N to become chaotic

  • Dynamical friction due to scattering damps re-circurlarizes orbits


Nice Model Can Explain…

  • Cataclysmic Late Heavy Bombardment 3.8 Gyrs ago

  • High inclinations of Jovian Trojans

  • Existence of cometary bodies in main asteroid belt

  • Significant non-zero inclinations and eccentricities of giant planets

  • Irregular satellite populations of giant planets


Nice Model Can Explain…

  • Cataclysmic Late Heavy Bombardment 3.8 Gyrs ago

  • High inclinations of Jovian Trojans

  • Existence of cometary bodies in main asteroid belt

  • Significant non-zero inclinations and eccentricities of giant planets

  • Irregular satellite populations of giant planets


Nice Model Can Explain…

  • Cataclysmic Late Heavy Bombardment 3.8 Gyrs ago

  • High inclinations of Jovian Trojans

  • Existence of cometary bodies in main asteroid belt

  • Significant non-zero inclinations and eccentricities of giant planets

  • Irregular satellite populations of giant planets


Nice Model Can Explain…

  • Cataclysmic Late Heavy Bombardment 3.8 Gyrs ago

  • High inclinations of Jovian Trojans

  • Existence of cometary bodies in main asteroid belt

  • Significant non-zero inclinations and eccentricities of giant planets

  • Irregular satellite populations of giant planets


Nice Model Can Explain…

  • Cataclysmic Late Heavy Bombardment 3.8 Gyrs ago

  • High inclinations of Jovian Trojans

  • Existence of cometary bodies in main asteroid belt

  • Significant non-zero inclinations and eccentricities of giant planets

  • Irregular satellite populations of giant planets


Outline

  • Description of Kuiper Belt

  • Giant Planet Migration and the Nice Model

  • Simulation Results

  • Conclusions


Simulations

  • Start planets at last scattering between Uranus and Neptune

  • Surround Neptune’s orbit with torus of 60,000 test particles extending to 34 AU

  • Vary Neptune’s starting place and e-damping in sims


Simulations


Observed

Simulated


Results Summary


Results Summary


Results Summary


Observed

Simulated


Results Summary


Results Summary


Observed

Simulated


Results Summary


Results Summary


Results Summary


Results Summary


Hot

Cold


Results Summary


Results Summary


Observed

Simulated


Results Summary


Conclusions

  • Nice Model reproduces more properties of Kuiper Belt than any other previous scenario

  • Eccentricities of cold belt too high by a factor of 2

  • May be due to unaccounted for physics such as collisional damping


  • Login