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Type Ia supernovae from violent mergers of carbon-oxygen white dwarfs: polarisation signatures
M. Bulla, S. A. Sim, R. Pakmor +5
The violent merger of two carbon-oxygen white dwarfs has been proposed as a viable progenitor for some Type Ia supernovae. However, it has been argued that the strong ejecta asymme…
Deflagrations in hybrid CONe white dwarfs: a route to explain the faint Type Iax supernova 2008ha
M. Kromer, S. T. Ohlmann, R. Pakmor +7
Stellar evolution models predict the existence of hybrid white dwarfs (WDs) with a carbon-oxygen core surrounded by an oxygen-neon mantle. Being born with masses ~1.1 Msun, hybrid…
500 Days of SN 2013dy: spectra and photometry from the ultraviolet to the infrared
Y. -C. Pan, R. J. Foley, M. Kromer +23
SN 2013dy is a Type Ia supernova for which we have compiled an extraordinary dataset spanning from 0.1 to ~ 500 days after explosion. We present 10 epochs of ultraviolet (UV) throu…
Polarisation spectral synthesis for Type Ia supernova explosion models
M. Bulla, S. A. Sim, M. Kromer
We present a Monte Carlo radiative transfer technique for calculating synthetic spectropolarimetry for multi-dimensional supernova explosion models. The approach utilises "virtual-…
No trace of a single-degenerate companion in late spectra of SNe 2011fe and 2014J
P. Lundqvist, A. Nyholm, F. Taddia +9
Left-over, ablated material from a possible non-degenerate companion can reveal itself after about one year in spectra of Type Ia SNe (SNe Ia). We have searched for such material i…