[Snickering Hound]

I think if we had a brown dwarf in our solar system we would know it.

The infrared Webb space telescope has ruled that out.

It easily would have picked up a brown or red dwarf.

Jury is still out on a earth sized or superearth.

[StormEye]

"The infrared Webb space telescope has ruled that out."

The James Webb Telescope won't be launched until 2020.
It's construction hasn't even been completed.