Exoplanet radial velocity curve. Here the orbit of an unseen exoplanet and parent star is shown on the left (masses exaggerated) and the radial velocity of the star is shown on the right. The observer is assumed to be at the top.
A corresponding video for an elliptical orbit is also available.
See http://astro.sunysb.edu/mzingale/software/astro/ for the python script that generates the frames for this movie
