Investigating the properties of stripped-envelope supernovae; what are the implications for their progenitors?. Issue 2 (7th December 2018)

• Record Type: Journal Article
• Authors: Prentice, S J; Ashall, C; James, P A; Short, L; Mazzali, P A; Bersier, D; Crowther, P A; Barbarino, C; Chen, T-W; Copperwheat, C M; Darnley, M J; Denneau, L; Elias-Rosa, N; Fraser, M; Galbany, L; Gal-Yam, A; Harmanen, J; Howell, D A; Hosseinzadeh, G; Inserra, C; Kankare, E; Karamehmetoglu, E; Lamb, G P; Limongi, M; Maguire, K; McCully, C; Olivares E, F; Piascik, A S; Pignata, G; Reichart, D E; Rest, A; Reynolds, T; Rodríguez, Ó; Saario, J L O; Schulze, S; Smartt, S J; Smith, K W; Sollerman, J; Stalder, B; Sullivan, M; Taddia, F; Valenti, S; Vergani, S D; Williams, S C; Young, D R;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 485:Issue 2(2019)
• Page Start: 1559
• Page End: 1578
• Publication Date: 2018-12-07
• Subjects: Supernovae: general; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty3399
• Languages: English
• ISSNs: 0035-8711

Abstract

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 56 Ni and ejecta masses ( M Ni and M ej ). 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 M ej distribution for 80 SE–SNe, the largest such sample in the literature to date, and shows that SNe Ib have the lowest median M ej, 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 M ej ranging from ∼1.2–11 M⊙, considerably greater than any other subtype. For all SE–SNe < M ej > = 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 M ZAMS <25 M⊙ . The low < M ej > 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.