The Rapid Rotation of Brown Dwarfs

Brown dwarfs are about the same size as Jupiter but rotate about once per hour.

via SyFy

If the brown dwarf spins rapidly, these features get smeared out due to the Doppler effect, where light gets shifted a bit in wavelength as an object approaches or recedes from us. When an object spins, part of it moves toward us and part moves away, so the overall effect is to broaden the spectral features in wavelength.

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