Early observations and analysis of the type Ia SN 2014J in M82

G. H. Marion, D. J. Sand, E. Y. Hsiao, D. P.K. Banerjee, S. Valenti, M. D. Stritzinger, J. Vinkó, V. Joshi, V. Venkataraman, N. M. Ashok, R. Amanullah, R. P. Binzel, J. J. Bochanski, G. L. Bryngelson, C. R. Burns, D. Drozdov, S. K. Fieber-Beyer, M. L. Graham, D. A. Howell, J. JohanssonR. P. Kirshner, P. A. Milne, J. Parrent, J. M. Silverman, R. J. Vervack, J. C. Wheeler

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62 Scopus citations


We present optical and near infrared (NIR) observations of the nearby Type Ia SN 2014J. Seventeen optical and 23 NIR spectra were obtained from 10 days before (-10d) to 10 days after (+10d) the time of maximum B-band brightness. The relative strengths of absorption features and their patterns of development can be compared at one day intervals throughout most of this period. Carbon is not detected in the optical spectra, but we identify C I λ1.0693 in the NIR spectra. Mg II lines with high oscillator strengths have higher initial velocities than other Mg II lines.We show that the velocity differences can be explained by differences in optical depths due to oscillator strengths. The spectra of SN 2014J show that it is a normal SN Ia, but many parameters are near the boundaries between normal and high-velocity subclasses. The velocities for O I, Mg II, Si II, S II, Ca II, and Fe II suggest that SN 2014J has a layered structure with little or no mixing. That result is consistent with the delayed detonation explosion models.We also report photometric observations, obtained from -10d to +29d, in the UBVRIJH and Ks bands. The template fitting package SNooPy is used to interpret the light curves and to derive photometric parameters. Using RV = 1.46, which is consistent with previous studies, SNooPy finds that AV = 1.80 for E (B - V)host = 1.23 ± 0.06 mag. The maximum B-band brightness of -19.19 ± 0.10 mag was reached on February 1.74 UT ± 0.13 days and the supernova has a decline parameter, Δm15, of 1.12 ± 0.02 mag.

Original languageEnglish (US)
Article number39
JournalAstrophysical Journal
Issue number1
StatePublished - Jan 1 2015


  • Infrared:General
  • Supernovae:General
  • Supernovae:Individual (2014j)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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