Doppler spectroscopy

Doppler spectroscopy (also known as the radial-velocity method, or colloquially, the wobble method) is an indirect method for detectingextrasolar planets and brown dwarfs from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star. As of January 2026, over 1,100 known extrasolar planets (about 19.0% of the total) have been discovered using Doppler spectroscopy.