Brown dwarf detection

Spot the brown dwarf 4 AU from its parent star!

Or maybe it's just a background star...

HST image credit: D. Golimowski

CAUTION: Alignments with < 1% probability do happen!

Can you spot the second background star in both images?

Here’s another star swarmed by five probable background stars:

Here’s a logarithmic stretch of the binary brown dwarf GL 569 Bab as well as its M dwarf primary, GL 569 A. Note the large speckle density, and therefore the beautiful Keck II adaptive optics correction.