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

Mazzali, PA ORCID: 0000-0001-6876-8284, Benetti, S, Stritzinger, M and 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). pp. 5560-5569. ISSN 0035-8711

Preview

Text A very low central oxygen mass in the peculiar type Ia SN 2010lp further diversity at the low-luminosity end of SNe Ia.pdf - Published Version Available under License Creative Commons Attribution. Download (964kB) | Preview

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] λ λ, 6300,6363 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.

Item Type:	Article
Uncontrolled Keywords:	Science & Technology; Physical Sciences; Astronomy & Astrophysics; radiative transfer; techniques: spectroscopic; supernovae: general; supernovae: individual (SN2010lp); WHITE-DWARFS; SUPERNOVA 1991BG; NEBULAR SPECTRA; PROGENITORS; EXTINCTION; EXPLOSIONS; COMPONENTS; ABUNDANCE; BINARIES; MODELS; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
Date of acceptance:	9 February 2022
Date of first compliant Open Access:	1 November 2022
Date Deposited:	01 Nov 2022 13:04
Last Modified:	05 Jul 2025 12:45
DOI or ID number:	10.1093/mnras/stac409
URI:	https://researchonline.ljmu.ac.uk/id/eprint/17987

View Item