Late Light Curves of Sub-luminous Type Ia Supernovae

Details Late Light Curves of Sub-luminous Type Ia Supernovae Late Light Curves of Sub-luminous Type Ia Supernovae

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1401l&link_type=abstract

American Astronomical Society Meeting 210, #14.01; Bulletin of the American Astronomical Society, Vol. 39, p.112

Astronomy and Astrophysics

Astronomy

Scientific paper

The late light curves of Type Ia supernovae (SNe Ia) are powered by the deposition of positron kinetic energy from the decay of 56Co into the supernova ejecta. It has been suggest that a fraction of these positrons can escape the ejecta and contribute to the Galactic 511 keV annihilation radiation (Chan & Lingenfelter 1993; Milne et al. 1999). Previous studies have modeled the late emission from SNe Ia as either complete and instantaneous trapping of all the positron in a radiation transport code, or energy deposition modeling transporting the positrons trough the ejecta allowing for some escape. A study of the late light curves of normally-luminous SNe Ia showed that neither method of modeling could completely explain the shape of the curves (Lair et al. 2006). To expand upon that work, we present the late light curves of subluminous SNe Ia, particularly SN 2003gs and SN 2004W, and discuss their implications for the treatment of positrons in SNe Ia models.

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