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Theses

Spectrophotometrie des supernovae de type Ia : extraction des donnees de SNIFS et premiers resultats

Abstract : This thesis takes place within the SuperNova factory experiment, which includes about 20 french and american searchers. The purpose is to improve the usage of type Ia supernovae in cosmology, both by improving our understanding of supernovae diversity and by increasing statistics for low redshift (between 0.03 and 0.08).

After a brief introduction to these aspects, I focused more specifically the SNfactory experiment, which includes two components : a search of supernovae with data from QUEST-II camera on a telescope on the Mont Palomar (California) and a follow-up with the SNIFS instrument, specifically designed for this task and mounted permanently on the University of Hawaii telescope on the Mauna Kea.

My task concerned SNIFS spectroscopic channels : a simulation of a datacube and a spectrum extraction method are thus presented here, with a discussion about the PSF to choose. The goal of 1 % precision in flux calibration in photometric nights seems to be reachable with my extraction code.

I finally presented an analysis of 10 SNIFS supernovae, including a measurement of expanding velocity evaluated from blueshift of 4 spectrum features with a new method I designed which is more robust and reproducible method. These measures point out that 20 % of the sample is clearly different from the average behaviour.
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https://tel.archives-ouvertes.fr/tel-00125450
Contributor : Sebastien Gilles <>
Submitted on : Friday, January 19, 2007 - 3:29:11 PM
Last modification on : Friday, April 10, 2020 - 5:30:10 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 10:18:13 PM

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  • HAL Id : tel-00125450, version 1

Citation

Sebastien Gilles. Spectrophotometrie des supernovae de type Ia : extraction des donnees de SNIFS et premiers resultats. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00125450⟩

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