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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3510
DTSTART:20141023T202500Z
DTEND:20141023T220000Z
DTSTAMP:20260419T161615Z
LAST-MODIFIED:20141020T131102Z
LOCATION:4421 Sterling Hall
SUMMARY:Single white dwarfs as Progenitors of Type Ia Supernovae?\, As
 tronomy Colloquium\, Professor Marina Orio\, UW Madison Astronomy Dept
DESCRIPTION: The "normally" accepted paradigm for type Ia supernovae (
 SNe Ia) involves a massive CO white dwarf\, or two white dwarfs\, in a
  binary system. However\, more and more evidence is being gathered\, s
 howing two observational facts: a) A very large fraction of SNe Ia mus
 t explode on sub-Chandrasekhar mass white dwarfs\, b) The SN Ia rate d
 epends on the star formation rate. I will show how these observations 
 can be explained with a simple model\,in which a single white dwarfs t
 riggers explosive pycnonuclear reactions involving impurities of hydro
 gen or helium. An explosion may occur evenin the initial post-AGB cool
 ing phase for very massive (m>1.2 M(sol) white dwarfs\, or much later\
 , just at the onset of the Debye cooling for white dwarfs in the 0.8-1
 .35 M(sol). Is this the the new road to take to fully understand the S
 Ne Ia? And are these powerful explosions really useful standard candle
 s for cosmology?<br>
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URL:https://www.physics.wisc.edu/events/?id=3510
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