a ce-wind model for sne ia · a ce-wind model for sne ia xiangcun meng yunnan observatories philipp...
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A CE-wind model for SNe Ia
Xiangcun MengYunnan Observatories
Philipp PodsiadlowskiOxford University
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Supernova
• Extremely bright stellar explosion
• Important for the production of the heavy elements
• Best distance indicators in the universe
The only reliable way of determining extragalactic distances is through supernova investigations. F. Zwicky
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redshift
distance
Distance indicator:
An accelerating -expansion universe !
• Riess A. et al., 1998, 2004• Perlmutter S. et al., 1999
• Tonry et al., 2003
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Lum
inos
ity
time
Phillips relation
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Understanding of type Ia Supernovae
What we know about SNe Ia:• Light Curves (temporal evolution of photometry)• Spectra (UV, optical, NIR)• Some relationships about SNe Ia
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Complex and simple theoretical models and simulations which reproduce observations very well
Branch+, 1985
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Open questions
• Progenitor model.
• Explosion model.
• Burning flame.
• Evolution with redshift.
• Origin of luminosity scatter.
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CO WD + star2 SN Ia
Single Degenerate Model
CO WD + MS, RG, Helium
Double Degenerate modelCO WD + CO WD
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• Hydrogen shell burningNomoto, 1982
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• In 1996 Hachisu Kato & Nomoto proposed an optically thick wind (OTW) model.
• Unprocessed matter is lost from the
system as the OTW.
Hachisu et al.1996,1999
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Question!
• Metallicity dependent
• OTW velocity
• How to adjust the helium flash and hydrogen burning.
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CEW model
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• Do not depend on metallicity.
• Low wind velocity.
• No fine-tuning
• Explain the number of SSSs.
• Explain the properties of RNe.
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The birth rate of SNe Ia from our CEW model is higher than that from OTW model by about 30%!
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Produce 2002ic-like supernova!Explain high-velocity feature!
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Our model is quite robust!
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Summary• Do not depend on metallicity• Wind velocity could be lower than 50~ 200 km/s.• Adjust helium flash itself.• May explain the number of SSSs.• May explain the properties of RNs.• The birth rate from the CE-Wind model is higher
than that from the OTW model by about 30%.• May produce 2002ic-like SN.
• May naturally explain the HVF of SNe Ia.• The CEW model is quite robust.
Share the merits of the OTW model, but conquer its shortcomings!
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Thank you!
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Outline
Supernova types
Introduction
CE-wind model