2000A&A...354..557C -
Astronomy and Astrophysics, volume 354, 557-566 (2000/2-2)
The nature of SN 1997D: low-mass progenitor and weak explosion.
CHUGAI N.N. and UTROBIN V.P.
Abstract (from CDS):
We analyzed the spectra and light curve of the peculiar type II-P supernova 1997D to recover ejecta parameters. The optimal hydrodynamical model of SN 1997D, which meets observational constraints at the photospheric epoch, suggests a low explosion energy of about 10
50erg, ejecta mass around 6M
☉, and presupernova radius near 85R
☉. We confirm the previous result by Turatto et al. (
1998ApJ...498L.129T) that the ejecta contain a very low amount of radioactive
56Ni (≃0.002M
☉). Modelling the nebular spectrum supports the hydrodynamical model and permits us to estimate the mass of freshly synthesized oxygen (0.02-0.07M
☉). Combined with the basic results of stellar evolution theory the obtained parameters of SN 1997D imply that the progenitor was a star from the 8-12M
☉ mass range at the main sequence. The fact that at least some progenitors from this mass range give rise to core-collapse supernovae with a low kinetic energy (≃10
50erg) and low amount of radioactive
56Ni (≃0.002M
☉) has no precedent and imposes important constraints on the explosion mechanism. We speculate that the galactic supernovae 1054 and 1181 could be attributed to SN 1997D-like events.
Abstract Copyright:
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Journal keyword(s):
supernovae: general - supernovae: individual: SN 1997D - ISM: supernova remnants
Simbad objects:
8
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