The Peculiar Type Ia Supernova 2005hk

Details The Peculiar Type Ia Supernova 2005hk The Peculiar Type Ia Supernova 2005hk

2006-11-10

arxiv.org/abs/astro-ph/0611354v1

AIPConf.Proc.924:336-341,2007

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, submitted to the proceedings of the conference``The Multicoloured Landscape of Compact Objects and their

Scientific paper

10.1063/1.2774878

We present a preliminary analysis of an extensive set of optical observations of the Type Ia SN 2005hk. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN 2005hk is more luminous than SN 2002cx, while still under-luminous compared to normal Type Ia supernovae. The spectrum at 9 days before maximum is dominated by conspicuous Fe III and Ni III lines, and the Si II 6355 line is also clearly visible. All these features have low velocity (~6000 km/s). The near maximum spectra show lines of Si II, S II, Fe II, Fe III, as well as other intermediate mass and iron group elements. Analysis with the code for synthetic spectra SYNOW indicates that all these spectral lines have similar velocities.

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