Optical and NIR observations of the nearby type Ia supernova SN 2014J

Abstract

Optical and NIR observations of the type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal SNe Ia, with a decline rate parameter $\Delta m_{15}(B)=1.08\pm 0.03$. The supernova reached $B$-band maximum on JD 2456690.14, at an apparent magnitude $m_B(max)=11.94$. The optical spectra show a red continuum with deep interstellar Na~{\sc i} absorption, but otherwise resemble those of normal SNe Ia. The Si~{\sc ii} $\lambda 6355$ feature indicates a velocity of $\sim 12000$ km s${}^{-1}$ at $B$-band maximum, which places SN 2014J at the border of the Normal Velocity and High Velocity group of SNe Ia. The velocity evolution of SN 2014J places it in the Low Velocity Gradient subclass, whereas the equivalent widths of Si~{\sc ii} features near $B$-band maximum place it at the border of the Core Normal and Broad Line subclasses of SNe Ia. An analytic model fit to the bolometric light curve indicates that a total of $\sim 1.3$ M${}_{\odot }$ was ejected in the explosion, and the ejected ${}^{56}$Ni mass $M_{Ni}\sim 0.6$ M${}_{\odot }$. The low [Fe~{\sc iii}] $\lambda 4701$ to [Fe~{\sc ii}] $\lambda 5200$ ratio in the nebular spectra of SN 2014J hints towards clumpiness in the ejecta. Optical broadband, linear polarimetric observations of SN 2014J obtained on four epochs indicate an almost constant polarization ($P_{\mathrm{R}}\sim$2.7 per cent; $\theta$ $\sim$37${}^{\circ }$), which suggests that the polarization signal is of interstellar origin.

16 pages, 21 figures, Accepted for publication in MNRAS

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• Observations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor System
• The intermediate nebular phase of SN 2014J: onset of clumping as the source of recombination
• The Late-Time Light Curves of Type Ia Supernovae: Confronting Models with Observations
• Mapping Circumstellar Matter with Polarized Light - The Case of Supernova 2014J in M82
• Near-infrared and Optical Nebular-phase Spectra of Type Ia Supernovae SN 2013aa and SN 2017cbv in NGC 5643
• SN 2017hpa: A carbon-rich type Ia supernova
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• SN 2014J in M82: New Insights On the Spectral Diversity of Type Ia Supernovae
• Highly reddened type Ia supernova SN 2004ab: another case of anomalous extinction
• TIFR Treasures for Astronomy from Ground to Space