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Post Info TOPIC: Supernova 2005hk


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Posts: 131433
Date:
2002cx-like supernova
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Title: 3D deflagration simulations leaving bound remnants: a model for 2002cx-like Type Ia supernovae
Authors: M. Kromer, M. Fink, V. Stanishev, S. Taubenberger, F. Ciaraldi-Schoolman, R. Pakmor, F. K. Roepke, A. J. Ruiter, I. R. Seitenzahl, S. A. Sim, G. Blanc, N. Elias-Rosa, W. Hillebrandt

Galactic jet 2002cx-like supernovae are a sub-class of sub-luminous Type Ia supernovae. Their light curves and spectra are characterised by distinct features that indicate strong mixing of the explosion ejecta. Pure turbulent deflagrations have been shown to produce such mixed ejecta. Here, we present hydrodynamics, nucleosynthesis and radiative transfer calculations for a 3D full-star deflagration of a Chandrasekhar-mass white dwarf. Our model is able to reproduce the characteristic observational features of SN 2005hk (a proto-typical 2002cx-like supernova), not only in the optical, but also in the near-infrared. For that purpose we present, for the first time, five near-infrared spectra of SN 2005hk from -0.2 to 26.6 days with respect to B-band maximum. Since our model burns only small parts of the initial white dwarf, it fails to completely unbind the white dwarf and leaves behind a bound remnant of ~1.03 solar masses -- consisting mainly of unburned carbon and oxygen, but also enriched by some amount of intermediate-mass and iron-group elements from the explosion products that fall back on the remnant. We discuss possibilities for detecting this bound remnant and how it might influence the late-time observables of 2002cx-like SNe.

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Posts: 131433
Date:
Supernova 2005hk
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Title: The Peculiar Type Ia Supernova 2005hk
Authors: V. Stanishev, S. Taubenberger, G. Blanc, G.C. Anupama, S. Benetti, E. Cappellaro, N. Elias-Rosa, C. Feron, A. Goobar, K. Krisciunas, A. Pastorello, D.K. Sahu, M.E. Salvo, B.P. Schmidt, J. Sollerman, C.C. Thone, M. Turatto, W. Hillebrandt

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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