N_exoplanets > N_T_dwarfs?!

I just realised something that seemed a bit odd today.

Pre-Kepler, we had ~450 exoplanets. That’s arguably ~750 now. And the big thousand can’t be far off.

However, T-dwarfs and exoplanets* were first confirmed at more or less the same time (1995-1996). But, there are still less than 200 T-dwarfs known, and if we add in the L dwarfs then we still don’t reach the magic thousand.

It just seems odd that the planetary regime is better-sampled than the bottom end of the ‘stellar’…

*Ignoring the pulsar planets, of course, because they live in the box marked ‘weird’ and ‘WTF?’. If we count them, then the exoplanets date is 1991.


2 Responses to “N_exoplanets > N_T_dwarfs?!”

  1. Another thing worth nothing, and along the same lines, is that with the Kepler candidates, small planets far outnumber large ones. It seems that not only is planet formation an efficient process, it forms preferentially small planets.

    • Yes, which is quite an interesting result in of itself. It’ll be interesting also to see what’s lurking in the 400 or so that they’re apparently sat on, too.

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