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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