Emission-line profiles in SNe Ib/c-Probing the ejecta geometry

Details Emission-line profiles in SNe Ib/c-Probing the ejecta geometry Emission-line profiles in SNe Ib/c-Probing the ejecta geometry

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1111..402t&link_type=abstract

PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen

Mathematics

Logic

Supernova Remnants, X- And Gamma-Ray Telescopes And Instrumentation, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

To constrain the ejecta geometry of stripped-envelope core-collapse SNe, we investigate nearly 100 nebular spectra of 39 objects, several previously unpublished. We perform a Gauss-fitting of [O I] λλ6300, 6364 in all spectra, and on the basis of the best-fit parameters organise the objects into morphological classes. We conclude that at least 40% of all SNe Ib/c must be aspherical. In some SNe, the [O I] line exhibits a variety of shifted secondary peaks or shoulders, interpreted as blobs of matter ejected at high velocity. The profile of Mg I] λ4571 generally resembles that of [O I] λλ6300, 6364, suggesting negligible contamination from other lines and confirming that O and Mg are similarly distributed within the ejecta.

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