Demonstration of Photon-Noise Limit in Stellar Radial Velocities

Details Demonstration of Photon-Noise Limit in Stellar Radial Velocities Demonstration of Photon-Noise Limit in Stellar Radial Velocities

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.241...61c&link_type=abstract

Astrophysics and Space Science, Volume 241, Issue 1, pp.61-76

Astronomy and Astrophysics

Astrophysics

8

Scientific paper

We have measured apparent fluctuations in stellar radial velocities with the ELODIE fiber-fed crossed-dispersion spectrograph and the 193-cm telescope of Observatoire de Haute-Provence. Within one given night, the fluctuations consist of two terms which may be sorted out. The first comes from imperfect scrambling of the stellar beam; the second arises from photon noise and agrees closely with our published calculations. So far, scrambler noise dominates for bright stars, but a perfect scrambler could be built by combining adatative optics and a single-mode fiber. The photon-noise results confirm that extrasolar planetary searching by the radial-velocity technique may be implemented with relatively small telescopes for a large number of stars. Consequences for the detection of ‘astrophysical noise” are discussed.

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