Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 420, Issue 4, Pages 3451-3468Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.20276.x
Keywords
line: formation; line: profiles; radiative transfer; supernovae: general
Categories
Funding
- Swedish Research Council
- Swedish National Space Board
- INAF
- Carlsberg foundation
- Danish National Research Foundation
- VLT [080.D-0213, 084.D-0261, 083.D-0131]
- NTT [083.D-0970, 184.D-1140]
- STFC [ST/I001123/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001123/1] Funding Source: researchfish
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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 angstrom 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 Ha line width and the mass of 56Ni is presented, suggesting that higher energy explosions are associated with higher 56Ni production.
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