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The Evolution of the Peculiar Type Ia Supernova SN 2005hk over 400 Days

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dc.contributor.author Sahu, D. K
dc.contributor.author Tanaka, M
dc.contributor.author Anupama, G. C
dc.contributor.author Kawabata, K. S
dc.contributor.author Maeda, K
dc.contributor.author Tominaga, N
dc.contributor.author Nomoto, K
dc.contributor.author Mazzali, P. A
dc.contributor.author Prabhu, T. P
dc.date.accessioned 2008-07-15T06:11:53Z
dc.date.available 2008-07-15T06:11:53Z
dc.date.issued 2008-06-10
dc.identifier.citation The Astrophysical Journal, Vol. 680, No. 1, pp. 580 – 592 en
dc.identifier.issn 0004-637X en
dc.identifier.uri http://hdl.handle.net/2248/2680
dc.description.abstract UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to “normal” Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained 200 days since explosion do not show the presence of forbidden [Fe ii], [Fe iii], and [Co iii] lines, but are dominated by narrow, permitted Fe ii, NIR Ca ii, and Na i lines with P Cygni profiles. The thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller ( ergs) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of synthesized in this explosion is 0.18 . The early spectra are successfully modeled with this less energetic model, with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component. en
dc.format.extent 1038961 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher The American Astronomical Society en
dc.relation.uri http://arxiv.org/abs/0710.3636 en
dc.relation.uri http://www.journals.uchicago.edu/doi/abs/10.1086/587772 en
dc.subject supernovae: general—supernovae: individual (SN 2005hk) en
dc.title The Evolution of the Peculiar Type Ia Supernova SN 2005hk over 400 Days en
dc.type Article en

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