Abstract
We present a study of the nebular phase spectra of a sample of Type
II-Plateau supernovae with identified progenitors or restrictive limits.
The evolution of line fluxes, shapes and velocities is compared within
the sample, and interpreted by the use of a spectral synthesis code. The
small diversity within the data set can be explained by strong mixing
occurring during the explosion, and by recognizing that most lines have
significant contributions from primordial metals in the H envelope,
which dominates the total ejecta mass in these types of objects. In
particular, when using the [O I] 6300, 6364 Å doublet for
estimating the core mass of the star, care has to be taken to account
for emission from primordial O in the envelope. Finally, a correlation
between the Hα line width and the mass of 56Ni is
presented, suggesting that higher energy explosions are associated with
higher 56Ni production.
Original language | English |
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Pages (from-to) | 3451-3468 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 420 |
Publication status | Published - 01 Mar 2012 |
Keywords
- line: formation
- line: profiles
- radiative transfer
- supernovae: general