«Paul Butler and I have been obtaining
precision radial velocity data of Kapteyn's star for over a decade at Keck, and were thus heavily invested in this work,» said Steve Vogt, a professor of astronomy at the University of California, Santa Cruz that contributed the data from Keck Observatory.
These new results have been obtained from analysing
data from two high -
precision planet surveys — the HARPS (High Accuracy
Radial Velocity Planet Searcher) and UVES (Ultraviolet and Visual Echelle Spectrograph)-- both operated by the European Southern Observatory in Chile.