G. Dhungana, R. Kehoe, J. Vinko, J. M. Silverman, J. C. Wheeler, W. Zheng, G. H. Marion, O. D. Fox, C. Akerlof, B. I. Biro, T. Borkovits, S. B. Cenko, K. I. Clubb, A. V. Filippenko, F. V. Ferrante, C. A. Gibson, M. L. Graham, T. Hegedus, P. Kelly, J. KelemenW. H. Lee, G. Marschalko, L. Molnár, A. P. Nagy, A. Ordasi, A. Pal, K. Sarneczky, I. Shivvers, R. Szakats, T. Szalai, E. Szegedi-Elek, P. Székely, A. Szing, K. Takáts, K. Vida

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33 Citations (Scopus)


We present extensive optical (UBV RI, griz, and open CCD) and near-infrared (ZY JH) photometry for the very nearby Type IIP SN 2013ej extending from +1 to +461 days after shock breakout, estimated to be MJD 56496.9 ± 0.3. Substantial time series ultraviolet and optical spectroscopy obtained from +8 to +135 days are also presented. Considering well-observed SNe IIP from the literature, we derive UBV RIJHK bolometric calibrations from UBV RI and unfiltered measurements that potentially reach 2% precision with a B-V colordependent correction. We observe moderately strong Si γ l6355 as early as +8 days. The photospheric velocity (vph) is determined by modeling the spectra in the vicinity of Fe γ l5169 whenever observed, and interpolating at photometric epochs based on a semianalytic method. This gives vph = 4500 ± 500 km s?1 at +50 days. We also observe spectral homogeneity of ultraviolet spectra at +1012 days for SNe IIP, while variations are evident a week after explosion. Using the expanding photosphere method, from combined analysis of SN 2013ej and SN 2002ap, we estimate the distance to the host galaxy to be 9.0+0.4 -0.6 Mpc, consistent with distance estimates from other methods. Photometric and spectroscopic analysis during the plateau phase, which we estimated to be 94 ± 7 days long, yields an explosion energy of 0.9 ± 0.3 × 1051 erg, a final pre-explosion progenitor mass of 15.2 ± 4.2 Mo and a radius of 250 ± 70 Ro. We observe a broken exponential profile beyond +120 days, with a break point at +183 ± 16 days. Measurements beyond this break time yield a 56Ni mass of 0.013 ± 0.001 Mo.

Original languageEnglish
Article number6
JournalAstrophysical Journal
Issue number1
Publication statusPublished - May 1 2016


  • galaxies: distances and redshifts
  • supernovae: general
  • supernovae: individual (SN 2013ej)
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Dhungana, G., Kehoe, R., Vinko, J., Silverman, J. M., Wheeler, J. C., Zheng, W., Marion, G. H., Fox, O. D., Akerlof, C., Biro, B. I., Borkovits, T., Cenko, S. B., Clubb, K. I., Filippenko, A. V., Ferrante, F. V., Gibson, C. A., Graham, M. L., Hegedus, T., Kelly, P., ... Vida, K. (2016). EXTENSIVE SPECTROSCOPY and PHOTOMETRY of the TYPE IIP SUPERNOVA 2013ej. Astrophysical Journal, 822(1), [6]. https://doi.org/10.3847/0004-637X/822/1/6