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Theses

Calibration des données spectroscopiques de la mission Gaia

Abstract : The Radial Velocity Spectrometer (RVS) of Gaia will collect spectra for about 100-200 million stars up to magnitude V~17 over the wavelength range 847 to 874 nm with a resolving power R = 11 500. The RVS possess no calibration device (such lamps or absorption cells). It cannot be calibrated with the "classical" approach based on dedicated calibration exposure. The aim of this thesis is to provides an efficient alternative to calibrate the RVS instrument. This new method is called Spectroscopic Global Iterative Solution (SGIS). The principle of SGIS is to use a set of "well-behaved stars" (bright, stable and of a well-suited spectral type). This method iteratively derive the radial velocity of the stars and the wavelength scale of the RVS instrument. During this thesis, a prototype of SGIS has been developed in order to validate the concept of SGIS and to evaluate the performances within the context of Gaia. The method of the wavelength scale calibration is a part of the spectroscopic data processing of Gaia. The developped prototype has been tested on 6 months of simulated data. After 6 iterations, the precision over the wavelength scale is about 50 meters per second.
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Antoine Guerrier. Calibration des données spectroscopiques de la mission Gaia. Astrophysique [astro-ph]. Observatoire de Paris, 2008. Français. ⟨tel-01958561⟩

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