Shaping the brown dwarf desert constraints from turbulent fragmentation
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Shaping the Brown Dwarf Desert: Constraints from Turbulent Fragmentation. Dr. Robert T. Fisher, Peter Jumper, and Deivid Ribeiro. What is the Brown Dwarf Desert?. The notable absence of brown dwarfs within five times the Earth-Sun distance from their central star.

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Shaping the brown dwarf desert constraints from turbulent fragmentation

Shaping the Brown Dwarf Desert: Constraints fromTurbulent Fragmentation

Dr. Robert T. Fisher,

Peter Jumper,

and DeividRibeiro


What is the brown dwarf desert
What is the Brown Dwarf Desert?

  • The notable absence of brown dwarfs within five times the Earth-Sun distance from their central star

(Grether and Lineweaver 2004)


Why do we care
Why Do We Care?

  • Improve understanding of angular momentum transfer in the star formation process

    • Scaled-up planets?

    • Scaled-down stars?


Past research
Past Research

  • Brown dwarfs migrating into the central stars proposed

Credit: Phil Armitage


Gravitational fragmentation model
Gravitational Fragmentation Model

  • Core: star-forming gaseous cloud

  • Models deal with the formation of two stars from the core

  • Mass and angular momentum of stars dependent on the core

ε* = (M1 + M2)/Mcore

εJ = J/Jcore


Turbulent fragmentation
Turbulent Fragmentation

  • Core angular momentum comes from turbulence

  • Net angular momentum is nonzero

Credit: (Seinfeld 1986)


Methodology
Methodology

  • Draw masses from the initial mass function

  • Gaussian random field gives turbulence and angular momentum

  • Calculate orbital parameters


Research progress
Research Progress

  • Conducting verification by reproducing results of an earlier paper

  • Troubleshooting

  • New initial mass function code prepared


Future plans
Future Plans

  • Conduct simulations for 200 brown dwarf – binary systems

  • Analysis of results



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