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Theses

Étalonnage spectro-photométrique du SuperNova Integral Field Spectrograph dans le cadre du projet the Nearby Supernova Factory

Abstract : Ten years ago, type Ia supernovae used as distances indicators led to the discovery of the accelerating expansion of the universe. Today, a second generation of surveys has significantly increased the high-redshift type Ia supernovae sample. The low-redshift sample was however still limiting the cosmological analysis using SNe. In this framework, the Nearby Supernova Factory has followed 200 nearby type Ia supernovae using the dedicated Supernovae Integral Field Spectrograph with spectro-photometric capacities. My PhD thesis has been carried out at the Institut de Physique Nucléaire de Lyon and at the Lawrence Berkeley National Laboratoryin the framework of the international cosmological project SNfactory. In order to reach the design spectrophotometric accuracy, attention has been focused on several key aspects of the calibration procedure, including: determination of a dedicated point spread function for 3D point source extraction, estimating the nightly photometric quality, derivation of the nightly sky extinction over the extended optical domain, its modeling in terms of physical components and its variability within a given night. A full multi-standards calibration pipeline has been implemented using approximately 4000 observations of spectrophotometric standard stars taken throughout the night over nearly 500 individual nights. Preliminary scientific results of the whole SNfactory collaboration will be presented at the end of this thesis.
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Clément Buton. Étalonnage spectro-photométrique du SuperNova Integral Field Spectrograph dans le cadre du projet the Nearby Supernova Factory. Autre. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10303⟩. ⟨tel-00465853v2⟩

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