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• W2135734021 abstract "We present optical photometric and spectroscopic observations of supernova 2013ej. It is one of the brightest type II supernovae exploded in a nearby ($sim 10$ Mpc) galaxy NGC 628. The light curve characteristics are similar to type II SNe, but with a relatively shorter ($ sim85 $ day) and steeper ($ sim1.7 $ mag (100 d)$^{-1} $ in V) plateau phase. The SN shows a large drop of 2.4 mag in V band brightness during plateau to nebular transition. The absolute ultraviolet (UV) light curves are identical to SN 2012aw, showing a similar UV plateau trend extending up to 85 days. The radioactive $^{56}$Ni mass estimated from the tail luminosity is $ 0.02 $M$_{odot}$ which is significantly lower than typical type IIP SNe. The characteristics of spectral features and evolution of line velocities indicate that SN 2013ej is a type II event. However, light curve characteristics and some spectroscopic features provide strong support in classifying it as a type IIL event. A detailed SYNOW modelling of spectra indicates the presence of some high velocity components in H$alpha$ and H$beta$ profiles, implying possible ejecta-CSM interaction. The nebular phase spectrum shows an unusual notch in the H$alpha$ emission which may indicate bipolar distribution of $^{56}$Ni. Modelling of the bolometric light curve yields a progenitor mass of $ sim14 $M$_{odot}$ and a radius of $ sim450 $R$_{odot}$, with a total explosion energy of $ sim2.3times10^{51} $ erg." @default.
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• W2135734021 date "2015-04-23" @default.
• W2135734021 modified "2023-09-27" @default.
• W2135734021 title "SN 2013ej - A type IIL supernova with weak signs of interaction" @default.
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