Late-Time Light from Type Ia Supernovae

Details Late-Time Light from Type Ia Supernovae Late-Time Light from Type Ia Supernovae

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80126g&link_type=abstract

Spitzer Proposal ID #80126

Physics

Scientific paper

We propose to study the physics of type Ia supernovae at late and very-late phases of their evolution. Type Ia events synthesize radioactive elements that keep the expanding debris glowing for years after the explosion. Our Spitzer observations combined with archival images show a wide range of mid-IR luminosities between 100 and 200 days after maximum light while optical light curves are very uniform. The IRAC bands appear be quite sensitve to ionization and excitation differences caused by density variations in the supernova nebulae. Beyond 200 days the energetics are driven by positrons alone and the light curve becomes sensitive to the magnetic environment of the debris. Dust formation, as confirmed in SN 2009dc with our Cycle 6 observations, or an IR catastrophe may also be important at very late times. We propose to observe five type Ia supernovae at late epochs with Spitzer. SN 2010ih, 2010eb and 2011B are nearby events that can be classically scheduled. We also request low-impact target-of-opportunity observations for two supernovae to be discovered during the cycle.

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