Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.........4m&link_type=abstract
PhD Thesis
Physics
3
Supernovae, Starburst Galaxies, Sn 1987A
Scientific paper
The feasibility of using near-IR observations to discover core-collapse supernovae (CCSNe) in the nuclear regions of nearby starburst galaxies is investigated here. For this an updated estimate of the intrinsic CCSN rates in these regions is determined. Also, new estimates of the extinction towards 33 supernova remnants (SNRs) in the prototypical starburst galaxy M 82 are derived. Near-infrared photometric data is assembled for a total of 13 CCSNe constituting the largest database of IR light curves for CCSNe. Template JHKL light curves are then derived for two SN classes, ``ordinary'' and ``slow-declining''. The efficiency of an image subtraction method (Alard & Lupton 1998) in SN detection is investigated, and a Monte Carlo simulation of a near-IR nuclear SN search is carried out. Finally, the results of the feasibility study are used to build a strategy for a near-IR nuclear SN search campaign with the William Herschel Telescope (WHT). The preliminary results from ongoing nuclear SN search with the WHT are presented in the end.
Optical spectroscopic data of the SN 1987A circumstellar medium (CSM) obtained at the Anglo-Australian Telescope (AAT) are used here, together with a collection of optical and near-IR CSM line fluxes from the literature, to construct a database of emission line light curves. These light curves cover the era from the time when the inner ring around SN 1987A first became visible at optical-NIR wavelengths until the time when the collision between the SN ejecta and the inner ring started to affect the observed line fluxes. The line light curves are modelled using an existing photoionisation code (Lundqvist & Fransson 1996). For this study, I extended the model to cover also the line fluxes of iron. Abundances of several elements, especially iron, are determined from the model fits, and the density structure of the CSM gas is investigated.
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