XPost: uk.sci.astronomy   
   From: hils@saynotospam.net   
      
   On 30/07/15 04:29, JAB wrote:   
   > On Wed, 29 Jul 2015 20:20:10 +0100, Hils  wrote:   
   >   
   >> fine article   
   >   
   > Source:   
   >   
   > http://www.caltech.edu/news/failed-stars-host-powerful-auroral-displays-47428   
      
   Excellent, thanks.   
      
   "In the case of brown dwarfs, charged particles cannot be driven into   
   their magnetosphere by a stellar wind, as there is no stellar wind to do   
   so. Hallinan says that some other source, such as an orbiting planet   
   moving through the brown dwarf's magnetosphere, may be generating a   
   current and producing the auroras. "But until we map the aurora   
   accurately, we won't be able to say where it's coming from," he says."   
      
   Wouldn't an "orbiting planet" have itself to be something like a gas   
   giant to produce the charged particles?   
      
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