Questions tagged [supernova]

A supernova is the explosive death of a star.

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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 ...
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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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Covariance of transformed random variable

So i have the covariance $cov (x_0 , x_1)$ and i know $m_b = -2.5 log_{10} (x_0) + constant$, then how do i calculate $cov (m_b , x_1)$ i found this but i guess it isnt useful here since it is ...
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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 ...
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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 ...
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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 ...
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Is the speed of ejected particles proportional to the mass of the supernova star?

Is the speed of ejected particles proportional to the mass of the supernova star? Has the nuclear explosion more power if the supernova object has more mass? In simple words is it true that there is ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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How close would a supernova be to endanger the astronauts on the ISS?

How close would a supernova be to endanger the astronauts on the ISS? Would Betelgeuse be close enough?
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Understanding the Chandrasekhar limit for white dwarfs and its relation with supernovas

So if I understand correctly, the Chandrasekhar limit ($\sim 1.4 \ M_{\odot}$) is the maximum mass that a white dwarf can have. Beyond this mass, the degeneracy pressure of the electrons can no longer ...
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Would a “black hole bomb” using dyson sphere and superradiant scattering destroy the blackhole? [closed]

I watched part of this Kurzgesagt video (link sends you to the video part) https://youtu.be/ulCdoCfw-bY?t=323 and part of this pbs spacetime video (link sends you to the video part) https://youtu.be/...
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What is the origin of photons in supernova explosion?

How and where (the ejecta or the core) are the photons (that we are receiving on earth) are produced in supernova explosions? What I understand is that the kinetic energy is converted to thermal ...
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How far should be a supernova to not be seen from Earth?

Hubble sphere is the limit of seeing objects from Earth. But if it wasn't like that would it be possible to see a supernova just because of luminosity over that distance. In simple words would a ...
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Is it possible to know in advance that Alpha Centauri has exploded?

Alpha Centauri is 4.3 light years away. If it exploded suddenly, would we be able to know this in advance? As the light from the supernova will not reach us before 4.3 years.
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In stellar frame dragging what is the 'frame'?

If a star rotation causes a frame rotation then there is an interaction between the two. Is it possible for the star to briefly expel this same frame away from its center when the star becomes a ...
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How to tell a population 3 star in red shifted galaxy?

I read that population 3 are metal poor stars especially those very very massive ones will quickly exhaust their fuel and goes into supernovae when their internal pressure drops due to pair ...
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3 votes
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How can one be sure that type-Ia supernovae have constant properties in time?

In this Wikipedia article there can be much read about type-Ia supernovae. One can read: This type Ia category of supernovae produces consistent peak luminosity because of the uniform mass of white ...
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What happens at the atomic level when a black hole forms?

As I understand it, during a gravitational collapse, the star stops fusion and gravity overcomes the radiation pressure. At that point, there is a point in space where there is a lot of gravity in a ...
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How long from star collapse to supernova explosion?

According to some reports, Betelgeuse might "be ready to explode into a supernova". It's luminosity has decreased "considerably" in the recent weeks. If we consider the "stable period" as that when ...
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How much larger would the IceCube Neutrino Observatory be to detect emissions from betelgeuse

How much larger would the IceCube Neutrino Observatory be to detect emissions from betelgeuse. I read that it is currently too far for us to detect whether a supernova is imminent. Would a larger ...
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Is the remnant of the Solar System's "parent" star still drifting in outer space?

As all elements which are heavier than iron, are only created through the process of either a supernova or a kilonova explosion. With us having naturally occurring elements such as uranium on Earth it ...
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Neutrino production in supernovae

As much as 99% of the gravitational energy liberated in a core collapse supernova emerges as kinetic energy of neutrinos. The neutrinos are produces in nuclear reactions (electron capture on nuclei ...
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Theoretically, Is it possible to create a nova by firing large masses into a sun?

In a science fiction story (Bobiverse) a nova is created by accelerating two small planets at relativistic speeds into a sun from opposite sides.The shockwave creates hydrogen fusion on opposite sides ...
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Why do Type II supernova happen? [duplicate]

I am an engineer and not a physicist. I am unable to understand why SuperNova happen. I understand that when the core is composed of high atomic number of elements like Iron and further fusion is not ...
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Supernovas create energy?

Ok here we go. Supernovas do have to have energy spent to explode, that is known. That explosion power also equals to the energy spent to cause said explosion, this is also known . Besides creating ...
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Percentage of Neutron Stars that leave the Galaxy

When a neutron star(NS) is born the supernova kick gives the newborn NS a certain boost in a supposed isotropic direction and, depending on how strong the boost is and on the position of the NS at ...
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3 votes
3 answers
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Why hydrogen lines are less visible in the Sun spectrum than in supernovae clouds?

Supernovae clouds are very colorful, and if I trust documentaries I watched, the colors are due to excitation of elements, as in fireworks. Since the Sun is mostly made of hydrogen, I suppose those ...
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How does a Thorne Zytkow star die?

A Thorne-Zytkow star is one where a red giant or supergiant contains a neutron star at its core, formed from the collision of the giant with the neutron star. It is believed that one has been found in ...
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Broadening of SNIa lightcurves

Is the observed delaying of photons emitted by SNIa best evidence that space is expanding or should this be explained otherwise and how?
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