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My research is focussed on computational modelling of supernova light curves and spectra. In particular, I am interested in trying to answer questions about stellar nucleosynthesis and the origin of the elements. Apart from hydrogen and helium, all elements in the Universe are created by the stars and are dispersed into the ISM through stellar winds and supernova explosions. In the nebular phase, supernovae display to us all the interior material of the exploded star; the only chance we have to see what a star is actually made of. This window of opportunity lasts between about 3 months and 2 years after explosion, after which most SNe become too faint or begin complex circumstellar interaction.
Only recently are we beginning to obtain good samples of supernova data in this phase, and models sophisticated enough to analyze what the physical conditions and chemical composition of the ejecta are. A summary of the nebular-phase modelling projects I've been involved in can be found here.
I am also part of the Superluminous Supernova research team at QUB; we are trying to understand the physical origin of a recently discovered class of extremely luminous supernovae that emit of order 10^51 erg of energy instead of the usual ~10^49 erg. Suggested origins for this energy include pair instability explosions, fast neutron star spin-down, and interaction with massive circumstellar shells. My work here has been mainly focussed on generalizing homologous models originally developed for radioactivity to work for SLSNe with arbitrary power sources, including calibrations to achieve accurate results also for the non-homologous case. A summary of the work by our group can be found here.
A list of other projects Ive been involved in (various topics) can be found here.