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Date and Time of the Query: 2019-06-26 T11:27:49 PDT
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For refcode 2015ApJ...806..160B:
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2015ApJ...806..160B SN 2013ej: A Type IIL Supernova with Weak Signs of Interaction Bose, Subhash; Sutaria, Firoza; Kumar, Brijesh; Duggal, Chetna; Misra, Kuntal; Brown, Peter J.; Singh, Mridweeka; Dwarkadas, Vikram; York, Donald G.; Chakraborti, Sayan; Chandola, H. C.; Dahlstrom, Julie; Ray, Alak; Safonova, Margarita Abstract. We present optical photometric and spectroscopic observations of SN 2013ej. It is one of the brightest Type II supernovae (SNe II) exploded in a nearby (~10 Mpc) galaxy, NGC 628. The light-curve characteristics are similar to SNe II, but with a relatively shorter (~85 days) and steeper (~1.7 mag (100 days)^-1^ in V) plateau phase. The SN shows a large drop of 2.4 mag in V-band brightness during the 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}_o_, which is significantly lower than typical SNe IIP. 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 modeling of spectra indicates the presence of some high-velocity components in Halpha and Hbeta profiles, implying a possible ejecta--circumstellar medium interaction. The nebular phase spectrum shows an unusual notch in the Halpha emission, which may indicate bipolar distribution of ^56^Ni. Modeling of the bolometric light curve yields a progenitor mass of ~14 {M}_o_ and a radius of ~450 {R}_o_, with a total explosion energy of ~ 2.3x {10}^51^ erg. Key words: galaxies: individual: NGC 0628, supernovae: general, supernovae: individual: SN 2013ej
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