An Extremely Luminous SN IIn With Long-lived Circumstellar Interaction

Details An Extremely Luminous SN IIn With Long-lived Circumstellar Interaction An Extremely Luminous SN IIn With Long-lived Circumstellar Interaction

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431603r&link_type=abstract

American Astronomical Society, AAS Meeting #214, #316.03; Bulletin of the American Astronomical Society, Vol. 41, p.762

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Scientific paper

We report the discovery of the most radiatively energetic SN, SM-2003-LMC-902, which was discovered serendipiteously by the SuperMACHO survey in 2003 behind the Large Magellanic Cloud. With a redshift of z=0.289, the dereddend absolute magnitudes of M_V -22.1 mag at peak rival the absolute magnitudes of SNe 2005ap and 2008es, the most luminous SNe ever observed. Unlike SNe 2005ap and 2008es, the light curve of SM-2003-LMC-902 has two very slow declining plateaus which push the integrated luminosity of SM-2003-LMC-902 well past that of other luminous SNe. The long-lived plateaus in the light-curve (only 3 magnitudes decline in I in 5 years) as well as a spectrum with relatively narrow emission lines from a circumstellar interaction are very similar to those of SN IIn 1988Z. The peak luminosity and long plateau indicate that the progenitor of SM-2003-LMC-902 was an extremely massive star.

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