Optical studies of two stripped envelope supernovae SN 2015ap (Type Ib) and SN 2016P (Type Ic)

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 M${}_{\odot }$ and 0.002 M${}_{\odot }$, ejecta masses of 3.75 M${}_{\odot }$ and 4.66 M${}_{\odot }$, spin period P${}_0$ of 25.8 ms and 36.5 ms and magnetic field B${}_p$ of 28.39 $\times$ 10${}^{14}$ Gauss and 35.3 $\times$ 10${}^{14}$ Gauss respectively. The early spectra of SN 2015ap shows 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 hints towards a progenitor mass between 12 $-$ 20 M${}_{\odot }$.

22 pages, 21 Figures, Accepted for publication in MNRAS, The replaced version includes high resolution corner plots

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