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TODCOR – Two-Dimensional Correlation

Published online by Cambridge University Press:  23 April 2012

Shay Zucker
Shay Zucker*
Affiliation:
Department of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact SciencesTel Aviv University, 69978 Tel Aviv, Israel email: shayz@post.tau.ac.il
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Abstract

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TODCOR is a TwO-Dimensional CORrelation technique to measure radial velocities of the two components of a spectroscopic binary. Assuming the spectra of the two components are known, the technique correlates an observed binary spectrum against a combination of the two spectra with different shifts. TODCOR measures simultaneously the radial velocities of the two stars by finding the maximum correlation. The main use of the technique has been to turn single-lined binaries into double-lined systems. This helps to explore the binary mass-ratio distribution, especially the low-mass regime, where the secondaries are usually very faint and therefore hard to detect. The technique has been generalized to study multi-order spectra, and also triple- and quadruple-lined systems. It has several applications in studying extrasolar planets and in the future may even help to dynamically measure stellar masses of binaries through relativistc effects.

Keywords

Celestial mechanicsmethods: data analysistechniques: radial velocitiestechniques: spectroscopicbinaries: spectroscopicstars: low massbrown dwarfsplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S282: From Interacting Binaries to Exoplanets: Essential Modeling Tools , July 2011 , pp. 371 - 378
Copyright
Copyright © International Astronomical Union 2012

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