B What is the relationship between brown dwarfs and giant gas planets?

[stefan r]

Hi @|Glitch|:

After thinking about the "homework" problem (my post #18) for a while, and unsuccessfully trying to research facts needed to do calculations, I have given up on it. I have located the title, etc., of a recent book which seems promising that it might have some of the facts I need to do the calculation. I have asked my local research librarian to try to borrow a copy for me.

http://www.springer.com/us/book/9783540431022​

I do have a new related question that has not so far been included in this thread's discussion. From all I have read I think I understand the concept discussed here of creating a definition of a "brown dwarf" in terms of theoretical criteria about the possibility that such an astronomical body can burn deuterium:

H+D->³He.​

Apparently such a definition does not include a requirement that an observation of such a body actually detect the burning of deuterium. It also seems that the definition does not require even the theoretical possibility of making such an observation with current (or expected near future) observational technology.

Q: Does anyone know if it is theoretically possibility to make such an observation with current (or expected near future) observational technology?

Regards,
Buzz

Measuring fusion in the sun is challenging. Theoretically you could put a neutrino detector inorbit around another star. However, proton to deuterium does not kick out a neutrino.

Easiest measurement is the surface. If there is no deuterium then it is likely that it burned. Taking measurements for a few thousand years should tell you something about the stars internal dynamics.

 

[Buzz Bloom]

Taking measurements for a few thousand years should tell you something about the stars internal dynamics.

Hi stefan:

I like your sense of humor.

Regards,
Buzz