Better Results Through Better Fibers: Improved Sensitivity on EXPERT

Details Better Results Through Better Fibers: Improved Sensitivity on EXPERT Better Results Through Better Fibers: Improved Sensitivity on EXPERT

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2408s&link_type=abstract

American Astronomical Society, AAS Meeting #212, #24.08; Bulletin of the American Astronomical Society, Vol. 40, p.533

Astronomy and Astrophysics

Astronomy

Scientific paper

EXPERT (Extremely high Precision ExtrasolaR Planet Tracker) is a dispersed fixed-delay interferometer (DFDI), that is designed for use at an astronomical telescope with a 2-4 meter diameter entrance aperture. It is an updated version of Exoplanet Tracker (ET) that is located at the Kitt Peak National Observatory 2.1m telescope. We significantly improved the throughput for EXPERT. We have higher quality fibers that resulted in an increased throughout by approximately 17 % as determined by a comparison of ET's and EXPERT's Doppler precisions. We have improved the coupling through these fibers, additionally increasing throughput. Our numerical simulations and these improvements are expected to result in more precise radial velocity measurements (0.5-1 m/s for V<8; solar type stars in a 15 minute exposure) in the search for Super Earths. This work is funded, in part, by the SRI (Space Research Initiative) Program.

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