Photometric and polarimetric observations of fast declining Type II supernovae 2013hj and 2014G

Abstract

We present broadband photometric and polarimetric observations of two type II supernovae (SNe) 2013hj and 2014G. SN 2014G is a spectroscopically classified type IIL event, which we also confirm photometrically as its light curve show characteristic features (plateau slope of 2.55 mag (100 d)${}^{-1}$ in V-band and duration of $\sim 77$d) of a generic IIL SN. On the other hand SN 2013hj also shows high plateau decline rate of $1.5$ mag (100 d)${}^{-1}$ in V-band, similar to SNe IIL, but marginally lower than SNe IIL template light curves. Our high cadence photometric observations of SNe 2013hj and 2014G enables us to cover all characteristic phases up to radioactive tail of optical light curves. Broadband polarimetric observations reveal some polarization in SN 2013hj with subtle enhancement as SN evolves towards plateau end, however the polarization angle remains constant throughout the evolution. This characteristic is consistent with the idea that the evolving SN with recombining hydrogen envelope is slowly revealing more asymmetric central region of explosion. Modelling of bolometric light curve yields a progenitor mass of $\sim 11$M${}_{\odot }$ with a radius of $\sim 700$R${}_{\odot }$ for SN 2013hj, while for SN 2014G model estimated progenitor mass is $\sim 9$M${}_{\odot }$ with a radius of $\sim 630$R${}_{\odot }$, both having a typical energy budget of $\sim 2\times 10^{51}$ erg.

22 pages, 10 figures, 9 tables. Accepted for publication in MNRAS

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