Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924212s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #242.12
Other
Scientific paper
We present optical photometry and time-series spectroscopy of five type Ia supernovae discovered by the Nearby Supernova Factory (SNfactory), which are spectroscopic matches to the candidate super-Chandrasekhar-mass event SN 2003fg. These supernovae are also overluminous (-19.5 < MV < -20) and, like the similar SN 2007if, the velocity of the Si II 6355 absorption minimum is consistent with being constant in time from the earliest available measurements to as late as two weeks after maximum light. We interpret the velocity plateau as evidence for a reverse-shock shell in the ejecta formed by interaction at early times with a compact envelope of surrounding material, as might be expected for SN events resulting from the mergers of two white dwarfs. We use the bolometric light curves and velocity evolution of these events to estimate important parameters of the progenitor systems, including 56Ni mass, total progenitor mass, and masses of shells and surrounding carbon/oxygen envelopes. We discuss the relationship of these events to classical 1991T-like SNe Ia and to other candidate super-Chandrasekhar-mass SNe Ia, and compare the mass distribution to that expected from population synthesis of merging white dwarf binary systems.
Nearby Supernova Factory
Scalzo Richard Allen
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