Artist's impression of the "super-aurorae" present at the magnetic poles of these radio emitting dwarfs which are responsible for the radio pulsations. (Image thanks to Gregg Hallinan, NUI Galway).

As a followup to the talk given at Galway Astrofest 2007 by Dr. Aaron Golden on work done by the Cool Stars research Group here at NUIG, the detail of this work were announced this week at the RAS National Astronomy Meeting 2007. Other press releases can be found at Spaceflight Now, and NRAO, though the best summary is probably at the NUIG Webpage (Thanks to Ronan Newman for the links). Kudos to all involved: Gregg and Stephen are currently writing up their PhDs and should have an interesting dissertions from this.

Basically, they discovered that some Brown Dwarfs can act as Pulsars, blasting out huge amounts of radio-wave energy. Brown Dwarfs are objects between 'Planet' and 'Star' in mass terms, often thought of as boring failed stars, not large enough to ignite into fusion. They were thought by most to be highly boring : this discovery was completely unexpected.

As the group in Galway has a lot of pulsar experience, they were well set to explain this. It looks as though this phenomena is due to a 'coherent maser' : an effect seen in large planets such as Jupiter, where the magnetic field spins up electrons from a solar wind. Certainly, it makes Brown Dwarfs, undiscovered until 1994 but thought to be widespread across the universe, more interesting things to look at.