Other
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60166g&link_type=abstract
Spitzer Proposal ID #60166
Other
Scientific paper
We propose to study the physics of type Ia supernovae at late and very-late phases of their evolution. Type Ia events produce radioactive elements that keep the expanding debris glowing for years after the explosion. Between one and three months after maximum, nearly all type Ia events have identical colors in optical bands: the Lira law. This is surprising and useful as it is not predicted by models but empirically allows dust reddening to be reliably measured. The colors in the infrared are not as well known and we propose to obtain multi-band light curves of three type Ia events during this 'Lira law' phase. These will be low-impact ToO observations triggered near maximum light with observations 5 weeks later. At very late times (>200 days) the supernova light is driven by positrons from the radioactive decay and the light curve becomes sensitive to the magnetic environment in the debris. As the type Ia ages, near-IR data suggest that more and more of the luminosity comes out at long wavelengths. We propose to observe SN2008Q and another nearby supernova to determine the fraction of bolometric luminosity coming from the mid-IR. These observations will be supported with an extensive network of ground-based telescopesE
Foley Ryan
Garnavich Peter
Krisciunas Kevin
Marion Howie
Matheson Thomas
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