A very low central oxygen mass in the peculiar type Ia SN 2010lp: further 
diversity at the low-luminosity end of SNe Ia

Mazzali, P. A.; Benetti, S.; Stritzinger, M.; Ashall, C.

doi:10.1093/mnras/stac409

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A very low central oxygen mass in the peculiar type Ia SN 2010lp: further diversity at the low-luminosity end of SNe Ia

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Mazzali, P. A.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Citation

Mazzali, P. A., Benetti, S., Stritzinger, M., & Ashall, C. (2022). A very low central oxygen mass in the peculiar type Ia SN 2010lp: further diversity at the low-luminosity end of SNe Ia. Monthly Notices of the Royal Astronomical Society, 511(4), 5560-5569. doi:10.1093/mnras/stac409.

Cite as: https://hdl.handle.net/21.11116/0000-000B-3719-C

Abstract

A nebular spectrum of the peculiar, low-luminosity type Ia supernova 2010lp is modelled in order to estimate the composition of the inner ejecta and to illuminate the nature of this event. Despite having a normally declining light curve, SN 2010lp was similar spectroscopically to SN 1991bg at early times. However, it showed a very unusual double-peaked [O i] λλ6300,6363 emission at late times (Taubenberger et al.). Modelling of the nebular spectrum suggests that a very small amount of oxygen (∼0.05 M_⊙), expanding at very low speed (≲ 2000 km s⁻¹) is sufficient to reproduce the observed emission. The rest of the nebula is not too dissimilar from SN 1991bg, except that SN 2010lp is slightly more luminous. The double-peaked [O i] emission suggests that SN 2010lp may be consistent with the merger or collision of two low-mass white dwarfs. The low end of the SN Ia luminosity sequence is clearly populated by diverse events, where different channels may contribute.