The Exoplanet Tracker is a prototype of a new type of fibre-fed instrument for performing high precision relative Doppler measurements to detect extra-solar planets .
A combination of Michelson interferometer and medium resolution spectrograph , this low-cost instrument facilitates radial velocity measurements with high throughput over a small bandwidth ( \sim 300 Å ) , and has the potential to be designed for multi-object operation with moderate bandwidths ( \sim 1000Å ) .
We present the first planet detection with this new type of instrument , a successful confirmation of the well established planetary companion to 51 Peg , showing an rms precision of 11.5 ms ^ { -1 } over five days .
We also show comparison measurements of the radial velocity stable star , \eta Cas , showing an rms precision of 7.9 ms ^ { -1 } over seven days .
These new results are starting to approach the precision levels obtained with traditional radial velocity techniques based on cross-dispersed echelles .
We anticipate that this new technique could have an important impact in the search for extra-solar planets .