Supernovae are some of the most energetic phenomena in the Universe and they have throughout history fascinated people as they appeared as new stars in the sky.

Supernova (SN) 1987A exploded in the nearby satellite galaxy, the Large Magellanic Cloud (LMC), at a distance of only 168 000 light years. The proximity of SN 1987A offers a unique opportunity to study the medium surrounding the supernova in great detail. Powered by the dynamical interaction of the ejecta with the inner circumstellar ring, SN 1987A is dramatically evolving at all wavelengths on time scales less than a year. This makes SN 1987A a great "laboratory" for studies of shock physics.

The thesis covers seven epochs of high resolution spectra of the ejecta-ring collision taken with the UVES echelle spectrograph at VLT
between October 1999 and November 2007. Thanks to the high spectral resolution of UVES, it has been possible to separate the shocked from the unshocked ring emission. The results presented in the thesis thereby give a better understanding of the evolution of SN 1987A.

Time:

Thursday 4 December, 10.30
Place: FA32, AlbaNova University Centre, Roslagstullsbacken 21

Link:
Thesis Kontakt:

Per Gröningsson, Tel: 08-5537 8536, per@astro.su.se