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Shaping the Brown Dwarf Desert: Constraints from Turbulent Fragmentation Dr. Robert T. Fisher, Peter Jumper, and Deivid Ribeiro

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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)

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

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

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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 * = (M 1 + M 2 )/M core ε J = J/J core

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

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

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

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

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R F For a central force the position and the force are anti- parallel, so r F=0. So, angular momentum, L, is constant N is torque Newton II, angular.

R F For a central force the position and the force are anti- parallel, so r F=0. So, angular momentum, L, is constant N is torque Newton II, angular.

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