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| Paper: |
The Fiber-Fed Spectrograph, a Tool to Detect Planets |
| Volume: |
185, Precise Stellar Radial Velocities, IAU Colloquium 170 |
| Page: |
13 |
| Authors: |
Queloz, D.; Casse, M.; Mayor, M. |
| Abstract: |
The measurement of the radial velocity of stars with precisions of 10 ms-1 or better over year-long time scales is a real challenge. The use of optical fibers to feed the spectrographs is one possible technical solution to reach this goal. It already proved to be successful with the very first detection by the ELODIE fiber-fed spectrograph of the planet orbiting the star 51Peg. In this review we shall start looking into the key issues to achieve high precision radial velocity measurements. Then a quick review of the use of fibers and their roles to overcome some of these problems will be given. The data reduction of echelle spectra measured with fiber-fed echelle spectrographs have some peculiarities which are worth addressing. This point will be discussed and the ELODIE pipeline reduction process will be used as an example. In order to improve the ultimate accuracy of fiber-fed spectrographs, various improvements have been recently implemented. I shall describe the double scrambler and the thorium simultaneous calibration concepts and I will illustrate their performances with results stemming from the ELODIE planetary search program and from the CORALIE first lights. |
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