Photometric and spectroscopic observations, and abundance tomography modelling of the Type Ia supernova SN 2014J located in M82

C. Ashall, P. Mazzali, D. Bersier, S. Hachinger, M. Phillips, S. Percival, P. James, K. Maguire

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Abstract

Spectroscopic and photometric observations of the nearby Type Ia Supernova (SN Ia) SN 2014J are presented. Spectroscopic observations were taken -8 to +10 d relative to B-band maximum, using FRODOSpec, a multipurpose integral-field unit spectrograph. The observations range from 3900 to 9000 Å. SN 2014J is located in M82 which makes it the closest SN Ia studied in at least the last 28 yr. It is a spectroscopically normal SN Ia with high-velocity features. We model the spectra of SN 2014J with a Monte Carlo radiative transfer code, using the abundance tomography technique. SN 2014J is highly reddened, with a host galaxy extinction of E(B - V) = 1.2 (RV = 1.38). It has a Δm15(B) of 1.08 ± 0.03 when corrected for extinction. As SN 2014J is a normal SN Ia, the density structure of the classical W7 model was selected. The model and photometric luminosities are both consistent with B-band maximum occurring on JD 245 6690.4 ± 0.12. The abundance of the SN 2014J behaves like other normal SN Ia, with significant amounts of silicon (12 per cent by mass) and sulphur (9 per cent by mass) at high velocities (12 300 km s-1) and the low-velocity ejecta (v <6500 km s-1) consists almost entirely of 56Ni.
Original languageEnglish
Pages (from-to)4427-4434
JournalMonthly Notices of the Royal Astronomical Society
Volume445
Issue number4
Early online date07 Nov 2014
DOIs
Publication statusPublished - 21 Dec 2014
Externally publishedYes

Keywords

  • radiative transfer
  • techniques: spectroscopic
  • supernovae: general
  • supernovae: individual: SN 2014J

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