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Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?

Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?
Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?
We present observations and analysis of 18 stripped-envelope supernovae observed during 2013–2018. This sample consists of five H/He-rich SNe, six H-poor/He-rich SNe, three narrow lined SNe Ic, and four broad lined SNe Ic. The peak luminosity and characteristic time-scales of the bolometric light curves are calculated, and the light curves modelled to derive 56Ni and ejecta masses (MNi and Mej). Additionally, the temperature evolution and spectral line velocity curves of each SN are examined. Analysis of the [O  i] line in the nebular phase of eight SNe suggests their progenitors had initial masses <20 M⊙. The bolometric light curve properties are examined in combination with those of other SE events from the literature. The resulting data set gives the Mej distribution for 80 SE–SNe, the largest such sample in the literature to date, and shows that SNe Ib have the lowest median Mej, followed by narrow-lined SNe Ic, H/He-rich SNe, broad-lined SNe Ic, and finally gamma-ray burst SNe. SNe Ic-6/7 show the largest spread of Mej ranging from ∼1.2–11 M⊙, considerably greater than any other subtype. For all SE–SNe <Mej> = 2.8 ± 1.5 M⊙ which further strengthens the evidence that SE–SNe arise from low-mass progenitors which are typically <5 M⊙ at the time of explosion, again suggesting MZAMS <25 M⊙. The low <Mej> and lack of clear bimodality in the distribution implies <30 M⊙ progenitors and that envelope stripping via binary interaction is the dominant evolutionary pathway of these SNe.
0035-8711
1559-1578
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Prentice, S.J.
2a990c7c-634b-4bb1-b205-5d5adaa1a92d
Ashall, C.
01b8c4e1-a4d5-4509-a0b7-e77a1b9d721b
James, P.A.
36f53f4f-63b8-456d-a1f5-c0d6138648c9
et al.
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Prentice, S.J.
2a990c7c-634b-4bb1-b205-5d5adaa1a92d
Ashall, C.
01b8c4e1-a4d5-4509-a0b7-e77a1b9d721b
James, P.A.
36f53f4f-63b8-456d-a1f5-c0d6138648c9

Sullivan, Mark, Prentice, S.J., Ashall, C. and James, P.A. , et al. (2018) Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors? Monthly Notices of the Royal Astronomical Society, 485, 1559-1578. (doi:10.1093/mnras/sty3399). (In Press)

Record type: Article

Abstract

We present observations and analysis of 18 stripped-envelope supernovae observed during 2013–2018. This sample consists of five H/He-rich SNe, six H-poor/He-rich SNe, three narrow lined SNe Ic, and four broad lined SNe Ic. The peak luminosity and characteristic time-scales of the bolometric light curves are calculated, and the light curves modelled to derive 56Ni and ejecta masses (MNi and Mej). Additionally, the temperature evolution and spectral line velocity curves of each SN are examined. Analysis of the [O  i] line in the nebular phase of eight SNe suggests their progenitors had initial masses <20 M⊙. The bolometric light curve properties are examined in combination with those of other SE events from the literature. The resulting data set gives the Mej distribution for 80 SE–SNe, the largest such sample in the literature to date, and shows that SNe Ib have the lowest median Mej, followed by narrow-lined SNe Ic, H/He-rich SNe, broad-lined SNe Ic, and finally gamma-ray burst SNe. SNe Ic-6/7 show the largest spread of Mej ranging from ∼1.2–11 M⊙, considerably greater than any other subtype. For all SE–SNe <Mej> = 2.8 ± 1.5 M⊙ which further strengthens the evidence that SE–SNe arise from low-mass progenitors which are typically <5 M⊙ at the time of explosion, again suggesting MZAMS <25 M⊙. The low <Mej> and lack of clear bimodality in the distribution implies <30 M⊙ progenitors and that envelope stripping via binary interaction is the dominant evolutionary pathway of these SNe.

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1812.03716 - Accepted Manuscript
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Accepted/In Press date: 10 December 2018

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Local EPrints ID: 429669
URI: https://eprints.soton.ac.uk/id/eprint/429669
ISSN: 0035-8711
PURE UUID: 063ee1eb-b5f1-4ce1-a589-a1c11265c169
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 03 Apr 2019 16:30
Last modified: 11 Apr 2019 00:31

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Author: Mark Sullivan ORCID iD
Author: S.J. Prentice
Author: C. Ashall
Author: P.A. James

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