'Quasi-Historical' Type Ia Supernova Remnants in the Large Magellanic Cloud: 'Massive' Ia's and Dust Destruction

Details 'Quasi-Historical' Type Ia Supernova Remnants in the Large Magellanic Cloud: 'Massive' Ia's and Dust Destruction 'Quasi-Historical' Type Ia Supernova Remnants in the Large Magellanic Cloud: 'Massive' Ia's and Dust Destruction

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40604r&link_type=abstract

Spitzer Proposal ID #40604

Computer Science

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Type Ia supernovae and their remnants play a major role in several areas of astrophysics, including chemical evolution of galaxies and cosmology. Recent results suggest that at least some SNe Ia may result from more massive progenitor systems than normally assumed. Historical SN Ia in our Galaxy, SN 1006, Tycho, and Kepler, with known ages and optically observed shock velocities, have provided important information on the SN Ia phenomenon; Kepler seems to have resulted from a 'massive' Type Ia. Three SNRs in the LMC have ages estimated from light echos, so they are 'quasi-historical.' N103B is interacting with dense, probably circumstellar material (CSM), like Kepler; 0509-67.5 has inferred efficient cosmic-ray acceleration; and the spectrum of the light echo from 0519-69.0 resembles that of the overluminous Type Ia event SN 1991T. In all cases, simply learning the ambient density can provide crucial information. Furthermore, all three objects have very fast shocks which can serve as laboratories for the study of grain destruction. We propose spectral mapping of all three with LL in both orders, and pointings at bright knots in N103B with SL. With our models of dust heating and sputtering in shocks, we can use this information to deduce ambient densities and to test the models. For the bright knots in N103B, probably CSM, we may obtain composition information of significance for constraining the nature of the progenitor.

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