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-s...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?