Georgios Leloudas – Niels Bohr Institute - University of Copenhagen


Georgios Leloudas

Title: OBSERVATIONS OF SUPERNOVAE AND THEIR ENVIRONMENTS

A thesis submitted May 6, 2010 for the degree of Doctor of Philosophy and defended June 24, 2010.

The Niels Bohr Institute, Dark Cosmology Centre, The Graduate School of Science,
Faculty of Science
University of Copenhagen
Denmark.

Primary Supervisor:
Jesper Sollerman

Chairperson:
Kristian Pedersen, DARK

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Abstract

OBSERVATIONS OF SUPERNOVAE AND THEIR ENVIRONMENTS

This PhD thesis presents work done in the field of supernovae (SNe) and the places where they occur.

Thermonuclear SNe are studied through extensive observations of SN 2003hv. This event was one of the brightest of the last decade allowing a follow-up campaign spanning over 700 days, including infrared wavelengths.

The study includes conclusions on the topics of positron escape, the "infrared catastrophe" and explosion asymmetry.

Core-collapse SNe that have been stripped of their hydrogen envelope (SNe Ib/c) are studied through their environments.

By comparing their locations within their host galaxies to those of Wolf-Rayet stars, which are their favored progenitors, it is shown that they are indeed compatible.

In addition, spectroscopic observations of a sample of SN Ib/c host galaxies are presented together with preliminary estimates on the explosion site metallicities.

Finally, the feasibility and impact of using the UltraVISTA galaxy survey to detect SNe is investigated and it is found very promising.

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