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Optical and UV studies of type Ia supernovae SN 2009ig and SN 2012cg

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dc.contributor.author Chakradhari, N. K
dc.contributor.author Sahu, D. K
dc.contributor.author Anupama, G. C
dc.date.accessioned 2020-11-20T13:17:45Z
dc.date.available 2020-11-20T13:17:45Z
dc.date.issued 2019-08
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 487, No. 2, pp. 1886-1904 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7323
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/stz1358 en_US
dc.description.abstract We present an extensive optical–ultraviolet photometry and analysis of a series of optical spectra of type Ia supernovae SN 2009ig and SN 2012cg. The observations range from −15 to +185 d for SN 2009ig and from −14 to 316 d for SN 2012cg, with respect to maximum light in B band. Both SN 2009ig and SN 2012cg exhibit similar properties. They have similar decline rate parameter (Δm15(B)true = 0.92 ± 0.04 for SN 2009ig and 0.93 ± 0.06 for SN 2012cg) and B band peak absolute magnitude (−19.45 ± 0.40 mag for SN 2009ig and −19.50 ± 0.31 mag for SN 2012cg). Their early spectra show high-velocity features in Si II and Ca II lines. The strong Fe III, Si III, and weak Si II λ5972 line during pre-maximum phase are indicative of hot photosphere. The post-maximum velocity evolution shows a plateau like phase with velocities ∼13 000 km s−1 for SN 2009ig and ∼10 000 km s−1 for SN 2012cg. Both events show spectral evolution similar to normal SNe Ia and fall in LVG and Core Normal subgroup. Both have smaller strength ratio [R(Si II) = 0.17 for SN 2009ig and 0.20 for SN 2012cg] consistent with smaller Δm15(B). Peak bolometric luminosities (⁠logLmaxbol⁠) of these events are estimated as 43.17 ± 0.16 and 43.24 ± 0.11 erg s−1 suggesting that 0.60 ± 0.20 M⊙ of 56Ni was synthesized in the explosion of SN 2009ig and 0.72 ± 0.31 M⊙ in SN 2012cg. 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 2009ig en_US
dc.subject Supernovae: individual: SN 2012cg en_US
dc.subject Galaxies: individual: NGC 1015 en_US
dc.subject Galaxies: individual: NGC 4424 en_US
dc.title Optical and UV studies of type Ia supernovae SN 2009ig and SN 2012cg en_US
dc.type Article en_US


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