TY - JOUR
T1 - [O i] λλ6300, 6364 in the nebular spectrum of a subluminous type ia supernova
AU - Taubenberger, S.
AU - Kromer, M.
AU - Pakmor, R.
AU - Pignata, G.
AU - Maeda, K.
AU - Hachinger, S.
AU - Leibundgut, B.
AU - Hillebrandt, W.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2013/10/1
Y1 - 2013/10/1
N2 - In this Letter, a late-phase spectrum of SN 2010lp, a subluminous Type Ia supernova (SN Ia), is presented and analyzed. As in 1991bg-like SNe Ia at comparable epochs, the spectrum is characterized by relatively broad [Fe II] and [Ca II] emission lines. However, instead of narrow [Fe III] and [Co III] lines that dominate the emission from the innermost regions of 1991bg-like supernovae (SNe), SN 2010lp shows [O I] λλ6300, 6364 emission, usually associated with core-collapse SNe and never previously observed in a subluminous thermonuclear explosion. The [O I] feature has a complex profile with two strong, narrow emission peaks. This suggests that oxygen is distributed in a non-spherical region close to the center of the ejecta, severely challenging most thermonuclear explosion models discussed in the literature. We conclude that, given these constraints, violent mergers are presently the most promising scenario to explain SN 2010lp.
AB - In this Letter, a late-phase spectrum of SN 2010lp, a subluminous Type Ia supernova (SN Ia), is presented and analyzed. As in 1991bg-like SNe Ia at comparable epochs, the spectrum is characterized by relatively broad [Fe II] and [Ca II] emission lines. However, instead of narrow [Fe III] and [Co III] lines that dominate the emission from the innermost regions of 1991bg-like supernovae (SNe), SN 2010lp shows [O I] λλ6300, 6364 emission, usually associated with core-collapse SNe and never previously observed in a subluminous thermonuclear explosion. The [O I] feature has a complex profile with two strong, narrow emission peaks. This suggests that oxygen is distributed in a non-spherical region close to the center of the ejecta, severely challenging most thermonuclear explosion models discussed in the literature. We conclude that, given these constraints, violent mergers are presently the most promising scenario to explain SN 2010lp.
KW - supernovae: general
KW - supernovae: individual (SN 2010lp, SN 1991bg, SN 1999by)
UR - http://www.scopus.com/inward/record.url?scp=84884838236&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/775/2/L43
DO - 10.1088/2041-8205/775/2/L43
M3 - Article
AN - SCOPUS:84884838236
VL - 775
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L43
ER -