Hi Guys

The whole point of the two articles was that normal statistics of D-D reactions might be changed deep down in Jupiter and so explain its heat-balance anomalies. That would make fusion the main source of Jupiter's energy output, hence why I asked when is a star not a star...

Adam

PS
Frank C answered it by pointing out the fact that we can see a star's output and rightly infer fusion in its guts.

I wonder how many 'brown dwarfs' will be brighter than we expect? If significant D-D fusion occurs at lower mass limits than 13.8 Jupiter masses then the temperature profiles and evolutionary tracks of such will be significantly distorted.