Radial velocity or Line-of-sight velocity, an object's speed straight towards or away from an observer
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Together with Otto Struve, he studied the rapid rotation of stars of young spectral types and measured the radial velocities of stars.
Using the radial velocity technique, the search for substellar companions has thus far failed to find a brown dwarf or extrasolar planet in the "hot zone" orbit around Kappa1 Ceti.
Queloz performed an analysis on 51 Pegasi using radial velocity measurements (Doppler effect), and was astonished to find a planet with an orbital period of 4.2 days.