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Supernova 2014J at M82 – II. Direct analysis of a middle-class Type Ia supernova
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(2016) Supernova 2014J at M82 – II. Direct analysis of a middle-class Type Ia supernova. Monthly Notices of the Royal Astronomical Society, 460 (2). pp. 1614-1624. doi:10.1093/mnras/stw1088 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stw1088
Abstract
We analyze a time series of optical spectra of SN 2014J from almost two weeks prior to maximum to nearly four months after maximum. We perform our analysis using the SYNOW code, which is well suited to track the distribution of the ions with velocity in the ejecta. We show that almost all of the spectral features during the entire epoch can be identified with permitted transitions of the common ions found in normal SNe Ia in agreement with previous studies. We show that 2014J is a relatively normal SN Ia. At early times the spectral features are dominated by Si II, S II, Mg II, and Ca II. These ions persist to maximum light with the appearance of Na I and Mg I. At later times iron-group elements also appear, as expected in the stratified abundance model of the formation of normal type Ia SNe. We do not find significant spectroscopic evidence for oxygen, until 100 days after maximum light. The +100 day identification of oxygen is tentative, and would imply significant mixing of unburned or only slight processed elements down to a velocity of 6,000 km~s−1. Our results are in relatively good agreement with other analyses in the IR. We briefly compare SN 2011fe to SN 2014J and conclude that the differences could be due to different central densities at ignition or differences in the C/O ratio of the progenitors.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 1 August 2016 | ||||||||||
Dates: |
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Volume: | 460 | ||||||||||
Number: | 2 | ||||||||||
Page Range: | pp. 1614-1624 | ||||||||||
DOI: | 10.1093/mnras/stw1088 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 8 August 2016 | ||||||||||
Date of first compliant Open Access: | 8 August 2016 | ||||||||||
Open Access Version: |
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