Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7801l&link_type=abstract
American Astronomical Society Meeting 210, #78.01; Bulletin of the American Astronomical Society, Vol. 39, p.185
Astronomy and Astrophysics
Astronomy
Scientific paper
Within the past few years, two (and possibly a third) unique binary systems have been found, that include brown dwarfs formed as the secondaries of a close binary system. When the primaries were on the main sequence, they would have been rare stars with close brown dwarf companions. In the red giant phases, the brown dwarfs survived common envelope evolution with what is now a white dwarf companion. Irradiation of the secondary in one system by the hot primaryproduces H-alpha emission such that solution of the double-lined, periodic velocities yields a mass of 55 Jupiter masses for the secondary, proving that it is a brown dwarf. In the second and possible third cases, found in our Sloan Digital Sky Survey work, the white dwarf is magnetic. Its radiation probably also induces the observed H-alpha emission from the late-L, substellar companion. The magnetic field captures some of the wind, producing cyclotron harmonic radiation in the infrared. These systems are pre-cataclysmic, and will reach Roche lobe overflow at extremely short CV orbital periods.
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