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

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dc.contributor.author Srivastav, S
dc.contributor.author Ninan, J. P
dc.contributor.author Kumar, B
dc.contributor.author Anupama, G. C
dc.contributor.author Sahu, D. K
dc.contributor.author Ojha, D. K
dc.contributor.author Prabhu, T. P
dc.date.accessioned 2020-11-19T14:06:50Z
dc.date.available 2020-11-19T14:06:50Z
dc.date.issued 2016-03
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 457, No. 1, pp. 1000-1014 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7299
dc.description Restricted Access © Royal Astronomical Society http://dx.doi.org/10.1093/mnras/stw039 en_US
dc.description.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 Type Ia supernovae (SNe Ia), with a decline rate parameter m 15 ( B ) = 1.08 ± 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 I absorption, but otherwise resemble those of normal SNe Ia. The Si II λ 6355 feature indicates a velocity of ∼ 12 000 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 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 ∼ 1.3 M was ejected in the explosion, and the ejected 56 Ni mass M Ni ∼ 0.6 M . The low [Fe III ] λ 4701 to [Fe II ] λ 5200 ratio in the nebular spectra of SN 2014J hints towards clumpiness in the ejecta. Optical broad-band, linear polarimetric observations of SN 2014J obtained on four epochs indicate an almost constant polarization ( P R ∼ 2.7 per cent; θ ∼ 37 ◦ ), which suggests that the polarization signal is of interstellar origin. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Supernovae: general en_US
dc.subject Supernovae: individual: SN 2014J en_US
dc.subject Galaxies: individual: M82 en_US
dc.title Optical and NIR observations of the nearby type Ia supernova SN 2014J en_US
dc.type Article en_US


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