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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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 (US)
Article number6
JournalAstrophysical Journal
Issue number1
StatePublished - May 1 2016

Bibliographical note

Funding Information:
This research was supported by NASA grant NNX10A196H (P.I. Kehoe), NSF grant AST-1109801 (P.I. Wheeler), and Hungarian OTKA grant NN 107637 (P.I. Vinko). J.M.S. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1302771. T.S. is funded by OTKA Postdoctoral Fellowship award PD 112325. K.S. has been supported by the Lendulet-2009 program of the Hungarian Academy of Sciences and ESA PECS Contract No. 4000110889/14/NL/NDe.

Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.


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


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