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Questions tagged [supernova]

A supernova is the explosive death of a star.

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What would happen if the sun became the size of the earth? [closed]

Imagine that a sudden force crushed the Sun from its current size down to the size of the earth,held it at that size for a few moments and then disappeared. What'd happen? I haven't done any of the ...
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Does the formation of a neutron star always require a supernova explosion?

Is a supernova explosion an essential condition for the formation of a neutron stars?
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Stellar Core Collapse Speeds

If gravity determines the speed of free falling objects, but stellar core collapses happen much faster than the speed of free falling objects, wouldn't that indicate that stellar core collapses are ...
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Is there an equation that can predict black hole formation from neutron star formation from supernova occurrence?

If supernovas can be predicted depending on the mass of the a star, (If its more than about 8 times the mass of sun it will eventually go supernova - https://www.space.com/23756-white-dwarf-stars.html)...
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Can kink oscillations in supernovae magnetic fields accelerate cosmic ray protons beyond the GZK limit?

Kink oscillations in coronal magnetic loops may be heating the ions in the sun's corona up to 10 million K and beyond. Could such oscillations in supernova impart enough extra energy to protons to ...
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What photon energy is needed to photodissociate large elements?

During core collapse, the heat and pressure produces photons with energy levels that photodissociate iron. I was wondering what photon energy is required to do such a thing?
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What is the correlation between the Hubble tension and Dark Energy?

When Dark Energy was first discovered it was because we noticed that distance type 1A supernovae were dimmer given their perspective redshifts. However, to determine the Hubble constant in the late ...
Python House's user avatar
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Neutrinos from a Type 1a Supernova

How much energy does a Type Ia Supernova produce in the form of neutrinos? I know that a Type II Supernova produces around $10^{45}$ joules worth of neutrinos, but not the amount produced by a Type 1a ...
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What's the nearest star that could go Supernova in the near future?

https://en.wikipedia.org/wiki/IK_Pegasi B is the nearest supernova candidate, but that white dwarf that's part of the system won't go supernova for around 2 billion years. What's the nearest star that ...
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Why are black holes sometimes formed without supernovae?

I've heard that very massive stars can sometimes collapse into black holes without creating supernovae. How does this happen? (I suspect it's something to do with the relative lack of Urca process ...
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Absence of Coulomb's force [closed]

I am interested in understanding the potential consequences if Coulomb's force were to suddenly vanish on the behavior and interactions of various objects. If this fundamental force suddenly ceases to ...
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Is it possible to witness supernova events from the past? Do they repeat?

Astrophysicist I know recorded one in 2008. Later found to be exactly as one that happened in 1988. Could this actually be the same? Do they repeat?
Michael Vincent's user avatar
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How many type II supernovae are there per stellar mass formed?

I have been searching for the number of type II (core-collapse) supernovae per unit of stellar mass formed. It is my understanding that a star must have an initial mass of at least 8 times and no more ...
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Why don't less massive stars explode in form of supernovas?

I'm a high school student with a question about supernovas and the life cycle of stars. I understand that supernovas occur in massive stars when they run out of fuel and collapse, resulting in a ...
Authentic Melody's user avatar
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Question on the relation between the Hubble constant and the absolute magnitude of Type Ia supernovae

I would like to ask a question about the relation between the Hubble constant and the absolute magnitude of supernovae I have read that supernovae alone cannot fix $H_0$ and that there is a ...
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Pair-instability supernovae: how does it happen?

How does the formation of electron positron pairs increase the energy density and softens the EOS? I trrying to understand the pair instability supernova. In many texts and articles, it is written ...
Debasish Dutta's user avatar
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Could we derive the mass of neutrinos using a supernova and gravitational lensing?

There are a lot of questions on this site about getting neutrino mass from timing the arrival of neutrinos vs light from a supernova, I believe this is different. If we see a galaxy that is ...
Joe's user avatar
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Supernovae apparent magnitude in a simplified LCDM model

I want to generate some fake apparent magnitude of supernovae Ia at different redshift using the LCDM model and the fiducial absolute magnitude of supernovae Ia (-19.35) and I want to compare it with ...
Alucard's user avatar
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Shock when a supernova explodes

I have been reading that when supernovae explode, they produce (Shockwaves) which act as cosmic accelerators. I do not understand, what is meant with "shock" (partially because I do not ...
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At what average rate do supernovas happen?

By average rate $R$, I mean I want an answer with units $$[R]=\frac{\text{supernovas}}{\text{length}^3 \cdot \text{time}}$$. That is to say, if I consider a huge volume $V$ and a long timeframe $T$, I ...
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Do supernovas vaporize the local space rocks 10 Pluto distances away?

In a follow-up to this question, What would it be like to watch an average space rock / ice comet at 1-20 Pluto distances from a supernova of $10^{44}$ joules? At what proximity would they become ...
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Supernova Observation and Hubble Parameter

“Their observations measured the evolution of the Hubble parameter over time by constructing a Hubble diagram: a plot of distance modulus versus redshift (Figure 11.33). For small $z$, the Hubble ...
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Where is the remnant of the supernova that killed off the Megalodon?

The claim is that a supernova about 150 light years from earth triggered a mass extinction about 2.6 million years ago which, among other things, killed off the Megalodon. https://earthsky.org/earth/...
Michael C. Kleder's user avatar
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Supernova light flash propagating through universe

Let the spherical light flash of a Supernove expand with c through the universe. Provided that the size of the unverse is limited, that sphere of light would inevitably reach a hypothesized end of the ...
Realist753's user avatar
4 votes
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How can we extract the Doppler shift of supernovae?

My understanding is that supernovae are used as standard candles, whose spectral lines indicate the recession velocity of the host galaxy. But the material from the supernova is ejected at a ...
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What would happen to a star caught in the path of an astrophysical jet?

The question pretty much captures it. What would happen to a star caught in the path of an astrophysical jet? I imagine the distance to the source of the jet, and the power of the source, matter most ...
Curious Layman's user avatar
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Could the center of the galaxy explode as a result of a chain reaction of stars going supernova?

I was reading "Ringworld" by Larry Niven. I'll spare you most of the details of the story, and say that one of the parts of the plot is that the center of the Milky Galaxy blows up, because ...
Curious Layman's user avatar
1 vote
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Could anything ever be brighter than the sun in our sky?

Is there anything that could explode or exist that would appear brighter than the sun in our sky? There was that meteor in Russia in 2013 where it appears brighter than the sun. However, is there a ...
Finlay Hutchinson's user avatar
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When a neutron star explodes, its gravity weaken so neutronium may fission, is there a mass defect as lighter elements than neutronium form?

When a neutron star explodes, its gravity weaken so neutronium may fission, is there a mass defect as lighter elements than neutronium form? As we get towards iron energy is released? Or not?
Krešimir Bradvica's user avatar
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Experimental Evidences against Dark Energy

Subir Sarkar proposed that dark energy does not exist, i.e. the cosmological constant of our universe may not be positive (https://arxiv.org/abs/2106.03119). His stance was based on the 740 type Ia ...
The Gypsy King's user avatar
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Would a supernova 1A appear to last longer if it were more distant and does it depend linearly on measured cosmological redshift?

Would a supernova 1A appear to last longer if seen more distant and does this depend linearly on measured cosmological redshift? I asked a question on a very popular radio station where they talked ...
Krešimir Bradvica's user avatar
1 vote
1 answer
145 views

Confusion with light year distance and space events

I had read that the Betelguese star may be going supernova in may of 2022. Now it is about 500 Light years away, so if we see a supernova explosion in may, then does that mean it occurred about 500 ...
Kshitij Kumar's user avatar
2 votes
2 answers
142 views

Does a core collapse supernova emit detectable gravitational waves?

I've read that LIGO will be the first thing to detect a "nearby" core collapse supernova, because the neutrino pulse travels slower than light, and the light is trapped inside the star for ...
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Why does the estimation of the distance of supernovae depends on the cosmological model?

I was reading a paper from arxiv (https://arxiv.org/abs/1312.5798) when I stumbled upon this passage at pag 4 "However, even at low redshifts, there are limitations to how well the Type Ia ...
Alucard's user avatar
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Energy released from forming a black hole?

Gravitational collapse release potential energy, in some cases a huge amount of it. In the case of a black hole, that collapse goes to "infinity" which suggests the release of "infinite&...
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Possible relation between internal and external magnetic field in Neutron Stars

I am wondering about a topic that disturbs me and regarding which I haven't found enough literature about. Neutron stars are thought to be highly magnetised objects. Generally one makes the ...
Gianluca's user avatar
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Calculation of the Collapse of Star into Black Hole [closed]

Using equations or a method of calculation using general relativity, how could one calculate the collapse of a star into a black hole?
Atley Anderson's user avatar
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1 answer
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Redshift graph of Type Ia supernova: Two case

The redshift graph obtained from a well-known supernova study appears in two cases in Google search. When I find the relevant data, regardless of whether the y-axis is set to distance or grade, the ...
teacher's user avatar
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2 votes
1 answer
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Is the internal energy of a supernova blast wave always 72% of the initial energy released?

In Astrophysics, an A-Z Introduction, Page 67, Patrick Betts states that in the Sedov-Taylor solution for a blast wave, the temperature of a supernova shell decreases over time, but the internal ...
Jack's user avatar
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1 answer
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Is a gamma ray burst cylindrical (like a beam) or a cone? Could one hit both Earth and Mars at the same time?

I've always seen a GRB as a beam in various depictions. Can this beam be as wide as the distance from Earth to Mars? As in, could the beam be 400 million km in width as it travels through space? Or is ...
Water's user avatar
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Where can I find the latest Cosmological Parameters derived from SNe Ia magnitudes?

I'm investigating the current crisis in Cosmology. I saw Dr. Becky quote the Hubble Constant, $H_0$, from Supernovae (SNe Ia) as 74.03. I'd like to punch the latest figures into my models. Does ...
Quark Soup's user avatar
2 votes
0 answers
101 views

Hubble constant, Riess and why has $q_0 = -0.55$ been used?

Lot's of scientists, including Riess, have done great work in trying to determine the Hubble constant, both from observation and theory. As everyone will know there still exists the problem with the ...
John Hunter's user avatar
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Black hole supernova [closed]

This is a question about my intuition of black holes. Assumption: The creation of a black hole follows the same physics as the creation of stars. A star can supernova, I'm assuming a black hole also ...
Matt Waldron's user avatar
2 votes
2 answers
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If a very distant supernova has a high Doppler effect redshift do our eyes see its evolution picture like in 'slow motion'?

If a very distant supernova has a high Doppler effect redshift do our eyes see its evolution picture like in 'slow motion'? If a same type of supernova apparently lasts longer if it has more ...
Janko Bradvica's user avatar
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1 answer
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Can the amount of mass of a supernova star force the expelled material to return to the origin of the explosion?

Can the amount of mass of a supernova star force the expelled material to return to the origin of the explosion?Like in the case when a rocket lounched from Earth has not suficient starting velocity ...
Janko Bradvica's user avatar
0 votes
1 answer
63 views

How do we obtain matter-lambda curve?

I have 400 supernovas type Ia's distance modulus and its error and redshift. how can I obtain an elliptic curve like the one in image for my datas? where did that elliptic came from?
Ali Rayat's user avatar
1 vote
1 answer
215 views

Relativistic Jets in Black Holes

It is understood till now that nothing is faster than speed of light and we also know that even light cannot come out of black hole(that’s why the name black). So does that mean that the Relativistic ...
FastAndTheCurious's user avatar
4 votes
1 answer
164 views

Pair-instability supernovae: a thermodynamic perspective

The discovery of a black-hole pair with "forbidden" masses has gotten me trying to understand pair-instability supernovae. A well-crafted sentence from a recent paper gives the explanation ...
rob's user avatar
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Black Hole Formation

If you plot a space-time diagram of an object falling through the event horizon of a black hole, and draw the past and future "light cones" of the object at every point, wouldn't the point ...
user250486's user avatar
2 votes
2 answers
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Could you know in advance specifically when a star will go supernova?

I've been thinking about star trek 2009 and star trek Picard in which they happen to talk about a sun inside a fictional solar system which goes supernova destroying a particularly important planet to ...
The victorious truther's user avatar

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