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Shaping the Brown Dwarf Desert: Constraints from Turbulent Fragmentation

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

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  1. Shaping the Brown Dwarf Desert: Constraints fromTurbulent Fragmentation Dr. Robert T. Fisher, Peter Jumper, and DeividRibeiro

  2. 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)

  3. Why Do We Care? • Improve understanding of angular momentum transfer in the star formation process • Scaled-up planets? • Scaled-down stars?

  4. Past Research • Brown dwarfs migrating into the central stars proposed Credit: Phil Armitage

  5. 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

  6. Turbulent Fragmentation • Core angular momentum comes from turbulence • Net angular momentum is nonzero Credit: (Seinfeld 1986)

  7. Methodology • Draw masses from the initial mass function • Gaussian random field gives turbulence and angular momentum • Calculate orbital parameters

  8. Research Progress • Conducting verification by reproducing results of an earlier paper • Troubleshooting • New initial mass function code prepared

  9. Future Plans • Conduct simulations for 200 brown dwarf – binary systems • Analysis of results

  10. Questions?

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