Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358l..59c&link_type=abstract
Astronomy and Astrophysics, v.358, p.L59-L62 (2000)
Astronomy and Astrophysics
Astrophysics
18
Methods: Data Analysis, Techniques: Spectroscopic
Scientific paper
We present an optimized algorithm to estimate from shifted stellar spectra the variations of radial velocity caused by a rotating planet. This algorithm is based on a rigorous approach in the spectral Fourier space that uses a weighted analysis of the cross spectrum phase between the high resolution spectra of the object and an appropriate reference. We give a simple method to calculate the best value of the stellar radial velocity in the presence of photon noise from a non linear least square fit, and we derive a formal expression for the velocity error. We show experimentally that the Fourier approach gives much better results than the classical cross-correlation technique.
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