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<-   Radial velocities   ->
images/spectro.gif
The displacement of dark bands in the spectrum of the star is the signature of the movement of the planet and the star around the barycenter of the system.
Copyright : Emmanuel Pécontal

The radial velocity V_R is the projection of the velocity vector of the star within the line of sight of the observer. For a planet with a circular orbit, this radial velocity at a given time is
(V_R)(t)=accent(V;->)*.*accent(z;->)=K*sin(2*pi*t/P)
where K is the variation amplitude of (V_R)(t), given by :
K=(M_(pl)*sin(i)/M_(étoile))*racine(GM_(étoile)/a)