Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0203h&link_type=abstract
American Astronomical Society Meeting 208, #2.03; Bulletin of the American Astronomical Society, Vol. 38, p.78
Other
Scientific paper
SNLS-03D3bb is the first high redshift (z=0.244) Type Ia supernova (SN Ia) with no obvious analogue at low redshift. It is one of the brightest SNe ever observed, with MV=-19.94, and it does not obey the usual lightcurve shape-luminosity relationship for SNe Ia. It also has a SiII velocity at +2 days after maximum light that is among the lowest ever seen -- 8000 km/s . Another unusual feature is evidence in the +2 day spectrum for unburned carbon, which implies turbulent, inefficient burning in the interior of the supernova. This is expected in a deflagration, but unexpected in models with a transition to detonation. PEGASE.2 fits to the host galaxy photometry show it has a high star formation rate ( 1.3 solar masses per year) and a low mass 109 solar masses), indicating a young progenitor. The extreme features of this SN Ia can be explained by an unusually massive progenitor white dwarf.
Astier Pierre
Balam David D.
Basa Stephane
Carlberg Ray
Conley Alex
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