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Circumstellar interaction of the type Ia supernova 2002ic

Lundqvist, P.; Chevalier, R. A.; Chugai, N. N.

We propose a model to account for the bolometric light curve, the quasi-continuum and the CaII emission features of the peculiar type Ia supernova (SN) 2002ic, which exploded in a dense circumstellar envelope. The model suggests that the SN Ia had the maximum possible kinetic energy and that the ejecta expand in an approximately spherically symmet…

Identifying young gamma-ray burst fossils

Ramirez-Ruiz, Enrico

The recent reports of temporal and spectral peculiarities in the early stages of some afterglows suggest that we may be wrong in postulating a central engine that becomes dormant after the burst itself. A continually decreasing post-burst relativistic outflow, such as put out by a decaying magnetar, may continue to be emitted for periods of days o…