Questions tagged [supernova]

A supernova is the explosive death of a star.

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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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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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SNIa lightcurves

How do you explain the fact that in SNIa lightcurves the rate of reception of photons is less than the rate of emission by a factor of 1+z?
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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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Why is there so much iron?

We all know where iron comes from. However, as I am reading up on supernovas, I started to wonder why there is as much iron as there is in the universe. Neither brown dwarfs nor white dwarfs deposit ...
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Did Supernova 2007bi really explode due to antimatter creation?

I was watching a video (https://www.youtube.com/watch?v=IZ59_akUUBs) about massive explosions and came across 2007bi. The video stated that this SN happened due to gamma-ray driven antimatter ...
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What is the magnitude of a super-nova on the Richter scale?

What is the richter scale of a super-nova? If one could measure compare it to standard earthquakes measured in logarithmic richter scale, what would be the value for a super-nova?
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Electric quadrupole radiation and supernova core collapse

I have a question when I'm learning the electric quadrupole radiation in E&M. In the radiation zone, the vector potential $\vec{A}(\vec{r},t)$ generated by the current distribution $\vec{J}(\vec{r}...
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Is there more iron or nickle in the core of a pre-supernova star?

For stars that undergo core collapse (leading to a core-collapse supernova or direct blackhole formation), the final stage of nuclear burning is silicon burning. Most online references I've found ...
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Do supernovae push neighboring stars outward?

I know that a supernova can mess up the heliosphere of nearby stars, but I'm wondering if it could physically push neighboring stars off their trajectories. It's fun to imagine all the stars ...
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How is black hole formed after a supernova explosion?

Does all the mass of a core collapsing star get scattered during a supernova explosion? If it does, then how can a black hole be formed without any remaining mass? Or are there remnants of the star ...
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Where are the high mass White Dwarfs that are going to create type 1a SN

The mass distribution of WD stars is explained at Why is the white-dwarf mass distribution highly peaked?. However this mass distribution shows very few stars that are about to exceed the WD limit of ...
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Symptoms of lethal neutrino radiation in a hypothetical scenario

Core collapse supernovae release the majority of their energy in the form of neutrinos. According to an XKCD What If, the neutrino radiation alone from a supernova at a distance of just 2 AU would be ...
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What would happen if gamma-ray burst from a supernova burst hit the sun? [closed]

What would happen if gamma-ray burst from a supernova burst hit the sun? Would the sun explode? Would the sun expand. Have a longer lifetime? Shorter Lifetime? Because people are nit-picky about stuff ...
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What will happen if a hypernova blast occurs very near to a supermassive black hole?

I ve studied that blackholes swallow everything that comes near to them and a supernova blast is so powerful that if it occurs at one end of our solar system it will destroy whole of it . What will ...
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What effect would a supernova have on an orbiting planet?

(Not sure if this is a better fit for worldbuilding.SE...) Suppose we have an earth-like planet orbiting comfortably far from a red giant of ~10 solar masses. If the star explodes in a supernova, what ...
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Astronomical sources of muons

I am looking for some sources of muon particles (μ) in astronomy. By this, I mean I am interested in any astrophysical event where theoretical presence of muons is suggested. For instance, does the ...
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Why does a star with its core collapsing and about to undergo a supernova, explode, instead of rapidly collapsing all of its matter into a black hole? [duplicate]

I am guessing this has something to do with density. I would assume that a massive star that has its core collapsing would be a prime candidate for having its core turn into a black-hole. If the ...
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Can you destroy the Sun if you throw enough iron into it? [duplicate]

i have a vague understanding of how the inside of the sun works, but i remember from class that when the sun started "making" iron on it's core, it cannot go further; can't make a heavier element. ...
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Why do neutron stars fed by another star not produce a second supernova like white dwarf supernovae?

According to Prof.Stassun in the Life and Death of Stars, neutron star sizes are limited by Neutron degeneracy pressure (and nuclear force) which states that the size of the star can be no greater ...
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What determines the outcome of a supernova?

Question: What determines the outcome of a supernova? When a sun collapses into itself creating a supernova what decides if it will be a white dwarf star, neutron star or black hole? I’ve pondered ...
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Gravity/Energy relationship

I understand that gravity is not energy, but is force, but my question revolves around if the presence of gravity in the universe results in a continuous amount of energy, from gravity-induced ...
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Have experiments looked at extra-galactic neutrino sources that would distinguish them from anti-neutrinos?

I understand the certain phenomenon even in other galaxies, such as supernovas, produce neutrinos that we can detect back here on Earth. I have also heard that we have experimental methods that can ...
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What causes a supernova explosion?

I know similar questions have been asked and answered. However, it is still not clear to me, so please bear with me if this is duplicate to some extent. The explanation goes like this - the core ...
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How do gold atoms formed in hypernova (or kilonova) explosions reunite?

It would seem that the force of the explosion, would disperse them over an extremely large area. How do they get reunited to one day be found clustered in flakes and nuggets? I get that gravity ...
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How likely is it that the mass of all humans was generated by the same supernova? [duplicate]

All humans are brothers. They came from the same supernova. ─ Allan Sandage (1926 - 2010) My gut (not a physicist) says not very likely at all. That being said, he was probably referring to ...
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What is the acceleration of expansion?

If me and my pet duck, who weighs next to nothing, were placed far away from any gravity source and in such a way that our mutual attraction was negligible, would I see my duck accelerate away from me?...
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Can Supernovas or other explosive events release relativistic bombs?

I recently asked a question in Space Travel SE where we were exploring ideas on how to get a space craft that weighs 1 kg to travel at 0.1c (one tenth the speed of light). At this rate, it would be ...
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Ways to make a star go supernova? [closed]

Asking for a fictional storyline. Say a type iii civilisation on kardashev scale want to make a star go supernova. Then what are the possible ways to achieve this? The said star being massive ...
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Why do the neutrinos (with mass) from a supernova arrive before the light (no mass)?

I've already read the below questions (and their answers) regarding neutrinos vs. electromagnetic waves propagating through space, but I'm still not clear on something. Neutrinos arrived before the ...
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Why do we detect neutrinos from core collapse SNR 2 hours before we detect light? [duplicate]

I have heard in a talk given at the Fermilab (on Youtube) that we typically detect a neutrino burst from a core-collapse supernova CC SNR explosion 2 hours before we detect its electromagnetic ...
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The difference total neutrino energy and neutrino enery for oscillation in Supnernova(SN)

I have very naive question about neutrino energy. I show in some papers the total neutrino energy in SN is same as 99% gravitational binding energy. So for 1987A SN is almost $10^{53}$erg. But when we ...
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Can nuclear fusion alone account for the energy output from type 1a supernova?

Unlike other supernova, which can vary in their size, Type Ia supernova are all about the same size. This is due to the fact that they are caused when a white dwarf star gains enough mass from its ...
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Can antimatter form when a neutron absorbs a very high energy neutrino of the right flavor?

Art McDonald and Takaaki Kajita won the 2015 Nobel Prize in physics for discovering the oscillations between the 3 flavors of neutrinos; Electron, Muon, and Tau. This discovery showed that neutrinos ...
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Novae versus supernovae type Ia

Why are there any novae at all? My understanding is that once accretion on a white dwarf exceeds the Chandrasekhar limit, the white dwarf undergoes a supernova. Why then do some just simply go nova?
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Why can't barium be produced in a supernova explosion?

In this video, Michael Merrifield claims that the elements barium, lanthanum and cerium cannot be produced within supernova explosions, and that they must be produced via a slower neutron-aggregation-...
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Could quasars produce elements heavier than oxygen?

I have read that supernovae are the main producers of elements heavier than oxygen. I just wonder whether quasars, which have been around a long time just like supernovae have, could have had a ...
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Accretion phase duration in a type 1a suernova [closed]

How long on average does the accretion phase last for a white dwarf in the buildup to supernova/nova, i.e; if it starts at approximately 1 solar mass, how long will it take to reach the 1.4 ...
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Mass of a black hole?

We know that a teaspoonfull of the mass of a black hole would weigh nearly a mountain on Earth. But when a star collapses into a black hole in a supernova. The pieces of the star fly off in the space. ...
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How do we know which lighter elements fuse to form heavier elements?

Formation of lighter elements is fairly straightforward: He + He + He = C-12. However for each heavier element (heavier than Fe in particular), is there exactly one combination of (two lighter) ...
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detonation and deflagration in supernovae

I'm reading about supernovae processes. The article mentions that there are these two processes in combustion, detonation and deflagration. The article goes on to state that the fact that a wide ...
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How do scientists know Iron-60 is created during supernovae?

I know that the meteoroids contain Ni-60, which is formed after decaying Fe-60, and as per my study, I got to know that Fe-60 is formed during the time of a supernova. But I wonder how scientists know/...
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How do we know the age of Uranium?

I understand that, overtime, Uranium decays into different elements until it finally reaches Lead, but how does that show the age of the Earth? I know it can be calculated by the amount of Lead in ...
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How does the number density of supernovae change with red shift

I am interested to know more about how the number of supernovae found changes according to their distance/red shift. I have heard but I can't remember where that the number of supernovae is greater ...
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Time dilation of distant cosmic events. What is it?

I was reading the Wikipedia's page about "tired light", where we read that any alternative explanation to the observed redshift (described by Hubble's law) should be able to overcome several ...
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How are we stardust?

I am a layperson and certainly not a physics student, though I'm sure that is palpably obvious. I have a strong appreciation for people like Carl Sagan, Lawrence Krauss, and Sean Carrol. I'm often ...
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When a star become black hole, does it attain a low entropy state?

When a star goes supernova, its net entropy increases. If the left over neutron star then collapses into a black hole, does it attain a lower entropy state?
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How long does or will Super Nova remnant be detectable/observable?

I am attempting to pin down the data on just how many Super Nova have occurred in the history of our Milky Way solar system. How can scientist detect the remains of a Supernova and for how long after ...
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What are the differences/similarities between supernova and helium flash?

I tried to search the internet but could not find a direct comparison. Is there any link between supernova and helium flash? If so, what is it? otherwise how they are different?