Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..371..447z&link_type=abstract
Statistical Challenges in Modern Astronomy IV ASP Conference Series, Vol. 371, proceedings of the conference held 12-15 June 200
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose a new approach to measure differential radial velocities for a set of observed spectra of the same object without any prior knowledge of the object spectrum. The proposed approach -- TIRAVEL (Template Independent RAdial VELocities) -- looks for the set of Doppler shifts that optimizes the mutual alignment of the set of observed spectra. We suggest a simple measure to quantify this mutual alignment. We report on a demonstration of the effectiveness of TIRAVEL that analyzes a sample of known spectroscopic binary stars. It shows that TIRAVEL may achieve a better precision than the commonly used correlation technique that uses a given template. Once generalized to multi-order spectra, TIRAVEL may improve the precise measurement of radial velocities of late-type stars in the search of extrasolar planets.
Mazeh Tsevi
Zucker Shay
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