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Nebular Spectroscopy of the Nearby Type IIb SN 2011dh | | Isaac Shivvers
; Paolo Mazzali
; Jeffrey M. Silverman
; János Botyánszki
; S. Bradley Cenko
; Alexei Filippenko
; Daniel Kasen
; Schuyler D. Van Dyk
; Kelsey I. Clubb
; | | Date: |
8 Jul 2013 | | Abstract: | We present nebular spectra of the nearby Type IIb supernova (SN) 2011dh taken
between 201 and 678 days after core collapse. At these late times, SN 2011dh
exhibits strong emission lines including a very broad and persistent H{alpha}
feature. New models of the nebular spectra confirm that the progenitor of SN
2011dh was a low-mass giant (M ~ 13 - 15 M_sun) that ejected ~0.7 M_sun of 56Ni
and ~0.27 M_sun of oxygen at the time of explosion, consistent with the recent
disappearance of a candidate yellow supergiant progenitor. We show that light
from the SN location is dominated by the fading SN at very late times (~2 yr)
and not, for example, by a binary companion or a background source. We present
evidence for interaction between the expanding SN blastwave and a circumstellar
medium at late times and show that the SN is likely powered by positron
deposition by ~1 yr after explosion. We also examine the geometry of the ejecta
and show that SN 2011dh’s nebular line profiles indicate a globally spherical
explosion with aspherical components or clumps. | | Source: | arXiv, 1307.2246 | | Services: | Forum | Review | PDF | Favorites | |
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