期刊
ASTROPHYSICAL JOURNAL
卷 806, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/806/2/160
关键词
galaxies: individual (NGC 0628); supernovae: general; supernovae: individual (SN 2013ej)
资金
- NASA's Astrophysics Data Analysis Program [NNX13AF35G]
- NASA through Chandra Award [GO2-13092B]
- NASA [NAS8-03060]
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 (similar to 10 Mpc) galaxy, NGC 628. The light-curve characteristics are similar to SNe II, but with a relatively shorter (similar to 85 days) and steeper (similar to 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 Ni-56 mass estimated from the tail luminosity is 0.02 M-circle dot, 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 H alpha and H beta profiles, implying a possible ejecta-circumstellar medium interaction. The nebular phase spectrum shows an unusual notch in the Ha emission, which may indicate bipolar distribution of Ni-56. Modeling of the bolometric light curve yields a progenitor mass of similar to 14 M-circle dot and a radius of similar to 450 R-circle dot, with a total explosion energy of similar to 2.3 x 10(51) erg.
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