SN 1998bw at Late Phases
J. SollermanEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85784 Garching bei München, GermanyCecilia KozmaStockholm Observatory, SE-133 36 Saltsjöbaden, SwedenClaes FranssonStockholm Observatory, SE-133 36 Saltsjöbaden, SwedenB. LeibundgutEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85784 Garching bei München, GermanyPeter LundqvistStockholm Observatory, SE-133 36 Saltsjöbaden, SwedenF. RydeStockholm Observatory, SE-133 36 Saltsjöbaden, SwedenP. A. WoudtEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85784 Garching bei München, Germany
2000en
ABI
Аннотация
We present observations of the peculiar supernova SN 1998bw, which was probably associated with GRB 980425. The photometric and spectroscopic evolution is monitored up to 500 days past explosion. We also present modeling based on spherically symmetric, massive progenitor models and very energetic explosions. The models allow line identification and clearly show the importance of mixing. From the late light curves we estimate that about 0.3-0.9 solar masses of ejected Nickel-56 is required to power the supernova.
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