Emission-line profiles in SNe Ib/c - Probing the ejecta geometry
- Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching (Germany)
- Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN (United Kingdom)
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of stripped-envelope core-collapse SNe, we investigate nearly 100 nebular spectra of 39 objects, several previously unpublished.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]{lambda}{lambda}6300, 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]{lambda}4571 generally resembles that of [O I]{lambda}{lambda}6300, 6364, suggesting negligible contamination from other lines and confirming that O and Mg are similarly distributed within the ejecta.
- OSTI ID:
- 21301148
- Journal Information:
- AIP Conference Proceedings, Vol. 1111, Issue 1; Conference: CEFALU 2008: International conference on probing stellar populations out to the distant Universe, Cefalu, Sicily (Italy), 7-19 Sep 2008; Other Information: DOI: 10.1063/1.3141583; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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