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SN 1a progenitors

  1. Aug 20, 2013 #1

    Chronos

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    In this paper, A statistical analysis of circumstellar material in Type Ia supernovae; http://arxiv.org/pdf/1308.3899v1.pdf, the authors make a case for separate progenitor classes for SN 1a. It looks persuasive. It appears they suggest the double degenerate model along with an accretion model.
     
  2. jcsd
  3. Aug 21, 2013 #2

    Garth

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    Interesting paper, thank you Chronos.

    From that paper,
    Remembering the original confusion over galactic distances that arose because it wasn't realised that there were two classes of Cepheid variables, which were and are used as 'standard candles', and that SN Ia are today used as standard candles measuring cosmological distances, might the possible existence of two classes of SNe Ia lead to a similar confusion over cosmological expansion rates?

    (Emphasis mine)
    Garth
     
  4. Aug 21, 2013 #3

    Chronos

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    Actually, I believe there are at least 3 [if not more] classes of SN Ia, but, I don't wish to divert discussion. They [and understandably] did not address the unusual 'super bright' category. My suspicion is the super bright class [e.g., SN 2007bi, 2006gy] has biased distance estimates.
     
    Last edited: Aug 21, 2013
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