Optical studies of two stripped-envelope supernovae – SN 2015ap (Type Ib) and SN 2016P (Type Ic). Issue 3 (7th July 2020)

• Record Type: Journal Article
• Authors: Gangopadhyay, Anjasha; Misra, Kuntal; Sahu, D K; Wang, Shan-Qin; Kumar, Brajesh; Li, Long; Anupama, G C; Dastidar, Raya; Elias-Rosa, N; Kumar, Brijesh; Singh, Mridweeka; Pandey, S B; Sanwal, Pankaj; Singh, Avinash; Srivastav, S; Tartaglia, L; Tomasella, L
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 497:Issue 3(2020)
• Page Start: 3770
• Page End: 3789
• Publication Date: 2020-07-07
• Subjects: techniques: photometric -- techniques: spectroscopic -- supernovae: general -- supernovae: individual: SNe 2015ap, 2016P -- galaxies: individual: IC 1776, NGC 5374 -- transients: supernovae; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1821
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present the photometric and spectroscopic studies of a Type Ib SN 2015ap and a Type Ic SN 2016P. SN 2015ap is one of the bright ( M V = −18.04 mag) Type Ib while SN 2016P lies at an average value among the Type Ic SNe ( M V = −17.53 mag). Bolometric light-curve modelling of SNe 2015ap and 2016P indicates that both the SNe are powered by 56 Ni + magnetar model with 56 Ni masses of 0.01 and 0.002 M⊙, ejecta masses of 3.75 and 4.66 M⊙, spin period P 0 of 25.8 and 36.5 ms, and magnetic field B p of 28.39 × 10 14 and 35.3 × 10 14 G, respectively. The early spectra of SN 2015ap show prominent lines of He with a 'W' feature due to Fe complexes while other lines of Mg ii, Na i, and Si ii are present in both SNe 2015ap and 2016P. Nebular phase [O i ] profile indicates an asymmetric profile in SN 2015ap. The [O i ]/[Ca ii ] ratio and nebular spectral modelling of SN 2015ap hint towards a progenitor mass between 12 and 20 M⊙ .