After an M, K, G, or F star forms, it magnetically compresses the infall dregs to produce a close in brown dwarf.
Cite
@article{arxiv.astro-ph/0105160,
title = {The "Extra-Solar Giant Planets" are Brown Dwarfs},
author = {Robert L. Kurucz},
journal= {arXiv preprint arXiv:astro-ph/0105160},
year = {2007}
}
Comments
3 pages, 5 figures in one file giantplanetfig.ps. Revised to include discussion of composition of brown dwarf