All Questions
Tagged with white-dwarf astrophysics
11 questions
4
votes
1
answer
116
views
Do neutrinos account for approximately 99% of the energy released by Type 1a supernovae as they do for Type II 'Core collapse' supernovae?
So many accounts say that neutrinos carry away about 99 percent of the energy from a 'traditional' supernova (giant star at end of its life), but what about a white dwarf detonated after accretion?
- 5,585
6
votes
1
answer
239
views
Why does a white dwarf sometimes go 'nova' and sometimes supernova (type 1a)?
Obviously, when a white dwarf goes truly supernova, there is nothing left, not even, I have heard, a neutron star or black hole...
But when certain white dwarf stars accrete certain amounts or types ...
- 5,585
4
votes
1
answer
606
views
How to calculate the number density of electrons?
I am trying to calculate the number density of electrons (number of electrons/m^3) for a white dwarf, knowing these parameters :
the mass and radius of the white dwarf (therefore its density (kg/m^3))...
- 43
6
votes
1
answer
257
views
Do “neutrino supernovae” exist?
Core collapse supernovae release most of their energy in the form of neutrinos. About 1% of the neutrinos are absorbed by the thick outer envelope which powers a spectacular supernova explosion.
Core ...
- 285
4
votes
1
answer
1k
views
What determines the temperature of a white dwarf?
Can someone please explain what determines the temperature of the white dwarf? Is more massive white dwarf hotter ? Also, is the density of a white dwarf always a constant?
- 503
8
votes
1
answer
178
views
Do all C-O white dwarfs have more-or-less the same proportions of carbon and oxygen?
Type 1a supernovae are known for having very consistent energy yields, and they are caused when a carbon-oxygen white dwarf reaches the Chandrasekhar limit of about 1.4 solar masses. Since type 1a ...
- 1,768
0
votes
1
answer
108
views
Is the structure of crystalized white dwarf related to nuclear pasta?
There is news of an analysis of a large number of nearby white dwarfs revealing a "pile-up" at a certain point in their cooling which has been predicted to happen due to a phase change where nuclear ...
- 30.7k
13
votes
5
answers
4k
views
Is there a possibility that a white dwarf can turn into a neutron star or a black hole?
I know that a white dwarf is supported mainly by electron degeneracy pressure and that if it gains more than about 1.4 solar masses from any source (such as a companion star or a collision), it ...
- 251
2
votes
2
answers
2k
views
What happens if a white dwarf collides with a star like our sun or a red dwarf?
Would it explode in a supernova or will it form a new star?
0
votes
1
answer
152
views
What if a white dwarf is less massive than her partner?
For example: a system with a 0.2 solar mass white dwarf orbiting a 0.25 solar mass red dwarf. Does the red dwarf steals mass from the white dwarf or vice versa.
1
vote
1
answer
755
views
What is the condition for the number density of a gas to be ultra-relativistic or non-relativistic and degenerate or ideal
What is the condition for the number density ($n$) of a gas to be ultra-relativistic or non-relativistic and degenerate or ideal?
I found problems in this subject when I was reading about White-...
- 493