Nebular emission-line profiles of Type Ib/c supernovae - Probing the ejecta asphericity
By Stefan Taubenberger, S. Valenti, S. Benetti, E. Cappellaro, M. Della Valle, N. Elias-Rosa, Stephan Hachinger, W. Hillebrandt, K. Maeda, P. Mazzali and 4 more. 2009
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In order to assess qualitatively the ejecta geometry of stripped-envelope core-collapse supernovae (SNe), we investigate 98 late-time spectra of 39 objects, many of them previously unpublished. We perform a Gauss-fitting of the [O i] λλ6300, 6364 feature in all spectra, with the position, full width at half maximum and intensity of the λ6300 Gaussian as free parameters, and the λ6364 Gaussian added appropriately to account for the doublet nature of the [O i] feature. On the basis of the best-fitting parameters, the objects are organized into morphological classes, and we conclude that at least half of all Type Ib/c SNe must be aspherical. Bipolar jet models do not seem to be universally applicable, as we find too few symmetric double-peaked [O i] profiles. In some objects, the [O i] line exhibits a variety of shifted secondary peaks or shoulders, interpreted as blobs of matter ejected at high velocity and possibly accompanied by neutron-star kicks to assure momentum conservation. At phases earlier than ∼200 d, a systematic blueshift of the [O i] λλ6300, 6364 line centroids can be discerned. Residual opacity provides the most convincing explanation of this phenomenon, photons emitted on the rear side of the SN being scattered or absorbed on their way through the ejecta. Once modified to account for the doublet nature of the oxygen feature, the profile of Mg i] λ4571 at sufficiently late phases 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.
Subfields: Astronomy and Astrophysics, Instrumentation, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/00417f829ab0d01e094f65a51a3e74c8930a41e9
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Citations in the corpus
- The diversity of Type II supernova versus the similarity in their progenitors (2016, background): “At this phase, SN II ejecta have sufficiently expanded that they become transparent to optical light (e.g., Fransson & Chevalier 1989; Taubenberger et al. 2009; Maguire et al. 2012).”
- NUCLEOSYNTHESIS IN TWO-DIMENSIONAL DELAYED DETONATION MODELS OF TYPE Ia SUPERNOVA EXPLOSIONS (2010, background): “• Line shifts: Profiles of nebular emission lines can be used to effectively trace the distribution of the burning products, as is proven to be efficient for core-collapse SNe (Maeda et al. 2002; Mazzali et al. 2005; Maeda et al. 2008; Modjaz et al. 2008; Taubenberger et al. 2009).”
- OPTICAL SPECTRA OF 73 STRIPPED-ENVELOPE CORE-COLLAPSE SUPERNOVAE (2014, background): “SN 2006aj/GRB 060218 was a well-observed SN Ic-bl/GRB (Campana et al. 2006; Modjaz et al. 2006; Pian et al. 2006; Sollerman et al. 2006; Mirabal et al. 2006; Cobb et al. 2006; Kocevski et al. 2007; Mazzali et al. 2007; Taubenberger et al. 2009).”
- FROM SHOCK BREAKOUT TO PEAK AND BEYOND: EXTENSIVE PANCHROMATIC OBSERVATIONS OF THE TYPE Ib SUPERNOVA 2008D ASSOCIATED WITH SWIFT X-RAY TRANSIENT 080109 (2008, background): “…have recently been observed in a number of strippedenvelope SNe (Mazzali et al. 2005; Maeda et al. 2007; Modjaz et al. 2008c; Maeda et al. 2008; Taubenberger et al. 2009), and have been interpreted in the framework of global asphericities, where the emitting oxygen-rich ejecta are situated in…”
- The Observer's Guide to the Gamma-Ray Burst-Supernova Connection (2016, background): “References [222, 232, 234] found that all SNe Ibc and IIb are aspherical explosions.”