On the Spectrum of the Peculiar Type Ia Supernova 1997br and the Nature of SN 1991T-like Events

Details On the Spectrum of the Peculiar Type Ia Supernova 1997br and the Nature of SN 1991T-like Events On the Spectrum of the Peculiar Type Ia Supernova 1997br and the Nature of SN 1991T-like Events

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.3804b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #38.04; Bulletin of the American Astronomical Society, Vol. 31, p.1424

Astronomy and Astrophysics

Astronomy

Scientific paper

In a recent paper (Fisher et al. 1999, MNRAS, 304, 67), we discussed the optical spectra and nature of the peculiar Type Ia SN 1991T, and argued that SN 1991T may have been produced by the merger of two white dwarfs, based on its inferred composition structure (co--existence of carbon and 56Ni in velocity space) as well as its over--luminosity. Li et al. (1999, AJ, 117, 2709) now have presented extensive observational data on the peculiar Type Ia SN 1997br, which closely resembled SN 1991T. In this poster we present some results of a direct analysis of the spectra of SN 1997br using the SYNOW spectrum synthesis code, and further discuss the nature of SN 1991T--like events. We find no evidence of carbon in the spectra of SN 1997br. The outer edge of the iron core is found to be around 12,500 km s-1, compared to 10,000 km s-1 in SN 1991T. Therefore we concur with Li et al. (1999) that SN 1997br was a slightly more powerful version of SN 1991T. The issues of whether or not SN 1991T--like events form a discrete subgroup of SNe Ia, and the extent to which the spectra of SN 1991T--like events could be consistent with standard delayed--detonation hydrodynamical models, are discussed.

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