Supernova Definition and 197 Threads

I read a scientific journal article that discusses pair instability supernova - I am puzzled about something discussed in the article. If the collision of atomic nuclei and energetic gamma rays produces electron and positron pairs which reduces the pressure inside a supermassive star's core -...

First thing i want to do is tell you what i do know. I know to that astronomers use a standard candle such as a Type 1a supernova or a cephied varibale because they are always the same brightness. I know that a light source is four times less bright when it is twice as distant. I know that...

After supernova explosion sound is created... so what happens to that sound??

how antigravity force is created before supernova explosion? why it is not created in a body less than chandrashekhar limit?

This paper - http://arxiv.org/abs/1505.05158, Strong Ultraviolet Pulse From a Newborn Type Ia Supernova- discusses the first well established evidence of a type Ia supernova formed via the single degenerate mode. The double degenerate mode has gained considerable support over the past decade or...

hello I have problems with the distance units used in cosmology: I wonder where is located a distant supernova at 48 "distance modulus", compared to the Hubble radius. Far much less? please use meters (x10^25 m) thank you in advance rachid

PF, I work as a researcher at my undergraduate institution. I have to give a presentation in a week and this question always gets me. What does learning the properties of these SNRs contribute to the overall body of knowledge? What does the scientific community gain from this knowledge...

I know that you can measure redshift from stars by looking at the shift in there balmer lines or more generally there line absorption spectra and seeing how far these lines have shifted from actual balmer lines or line absorption spectra of the same elements on earth. But how would you...

The supernova happened long ago of course, but as far as I know it is the first time the visibility for us is predicted in advance: the host galaxy is at a redshift of 1.49, and due to gravitational lensing we see multiple images with a significant time delay between them. I don't understand the...

I am trying to understand how the width of a supernova light curve depends on the redshift of its component frequencies. Let us make the simple assumption that the light curve is Gaussian. The inverse Fourier transform of a Gaussian is given by: $$\large e^{-\alpha...

What would happen if there was a supernova explosion near a black hole ? Would it just sit there and absorb all the energy incident on it ? Or would it simply vaporize into elementary particles ? And if it does vaporize, could the remnants give us a clue as to the quantum state of matter inside...

News Story US 708: Hypervelocity Star Ejected by Supernova Breaks Galactic Speed Record I recently posted about a link about a hypervelocity globular cluster. Today a story comes out discussing the fastest known hypervelocity star. SDSS J093320.86+441705.4 It is a white dwarf star apparently...

Here is a link to an interesting article I wanted to share with the community. It talks about how astronomers are watching the same supernova over and over again due to gravitational lensing. The data they are gathering will supposedly shed new insights into dark matter as well...

Type Ia Supernova are generally thought to be white dwarfs that, either by accretion of mass from a companion (single degenerate), or as a result of a merger with a white dwarf companion (double degenerate), approach and then exceed 99% of the Chandrasekhar limit of about 1.44 M☉, at which point...

Is it just nuclear fusion?

In How A Supernova Explodes, Scientific American, by Bethe and Brown, there is this passage. Wow 10% of the mass equivalent of the neutron star. What an amazing number. But as I see it, the number of neutrinos should equal the number of protons in the pre collapse core material (which...

hi guys, my first post... i was wondering if there is anyway of stopping a star from going supernova... my proposal is as follows: if you where to have a star about to go supernova, (as a result of lack of fusion) in the middle of space, and then you had super massive bodies surrounding...

So at some point nuclear fusion in a star becomes unable to sustain the core against its own gravity pressure, then the core collapses and the surface explodes in supernova explosion. What actually happens when the core collapse that makes the surface explode, and why would the core not explode...

I wanted to find out the difference between a supernova, and the energy it would take to blow up the Solar System. This guy: http://www.madsci.org/posts/archives/2001-11/1004909251.As.r.html Says it would take the equiv of 5.09x 10^37 Tons of TNT to blow up the Solar System...

Hi, What would be a plausible explanation for the induced supernova of a star? (Or at least an explanation that had a shot at being plausible!) What about a large antimatter explosion in the star's core, perhaps deposited there through a small wormhole? Or could some kind of missile be...

Heavier elements like gold, uranium etc. are formed at the end of a star's life. As the star explodes into a supernova, it gives rise to nebula which is the birthplace of new stars. But as the star has already fused lighter elements into heavier elements, where does the new hydrogen required for...

... figure it out 1. if a typical supernova ejects 2 solar masses of matter at a root mean speed of 7000km/s, how much energy is available in the expanding remnant? 2. Homework Equations : unsure 3. The Attempt at a Solution : E = 1/2 mv^2 then divide by the volume...

Falling matter of supernova does "work" heating the core? A supernova core collapses and the rest of the star follows, inner layers arrive first, a shock wave wave forms? As outer layers continue to collapse and slow down is there a large radial time rate change in momentum as rapidly...

Stimulated virtual W+, W- when supernova core--> neutron star? Weak interactions allow supernova core electrons and protons to convert to neutrons and neutrinos allowing (under the right conditions) the formation of a neutron star? Large numbers virtual W+ and W-bosons are produced in a short...

A Super nova is just getting warmed up in M82. Note for you astrophotographers, they are looking for any recent photos of this piece of sky .

Now I know the sun can't go supernova ever, but let's say the sun somehow acquires enough mass to eventually undergo a supernova with an energy output of one foe, what would happen to the solar system? Would the outer planets such as the gas giants and pluto survive?

Yes, tonight, right past midnight while I was driving home. I was looking at Orion through my windshield at the red light, when the light turned green I started to accelerate, just as I started, Orion's arm exploded. OMG This is it, one of the greatest moments I've always dreamed of. I...

My understanding of Gravity Gravity is a force which is acting on all celestial bodies and exerting pressure on them from all directions (Ex.1 Like water exerts pressure on a submarine when dives) Stars when loose their fuel can't withstand this force and shrink and shrink where they can't...

Is it true that professional and amateur astronomers can anticipate supernova photon-stream by means of neutrino detectors, how does it works?

When media reports a supernova it sounds like it happened just a while ago despite the photon stream came from say 10 million light-years away. Is it approximately correct to tell the layman that actually that supernova happened 10 million years ago because it took that time for its light to...

I was reading an article and came across the idea that cosmological measurements of the angular distance diameter could be used to prove that supernova dimming did not occur due to dark energy. However I could not wrap my head around it. Angular distance diameter is giving by: dA = x / θ...

Hello community, I really need help with few assignments! First one would be about Supernova: In a distant galaxy a supernova flash occured. When supernova reached luminosity maximum, galaxy apparent magnitude was 17,6. Before the supernova flash the galaxy apparent magnitude was 18,0. What...

The initial flux of neutrinos from a supernova is mostly radial (say we are far from where they are produced but also far below the top of the dying star)? As the neutrinos help blow the top off the star do the density variations of the outer portions of the star act like a variable index of...

Hello, I want to understand: just as the Crab Nebula is the result of SN 1054 and has a neutron star spinning at the center: (a) Does all supernova produces a nebula? (b) Does all supernova remnant has a neutron star at the center? (c) What is the outcome of Kepler supernova i.e. SN...

In a type II supernova If I remember correctly the core of the star collapses and turns to a neutron star. The envelope then will accelerate towards the core. The energy then come from the release of the kinetic energy of the infalling particles as they are brought to an abrupt stop by the...

Hi, Could someone point me towards a paper with the latest magnitude-redshift results for large z supernova? Thanks, John

A new paper on supernova 1a distance calibration 'The luminosity of supernovae of type Ia from TRGB distances and the value of H_0' - http://arxiv.org/abs/1208.5054 - brings into question the value of Ho. The authors derive a value of H0 = 63.7, considerably below the present accepted value of...

After reading this article: http://www.sciencedaily.com/releases/2012/08/120802133653.htm I was wondering if the shock wave from the super nova could still be detected? If so, could we figure out what region the supernova came from?

I need a list of type Ia supernova with redshifts, Distance Modulus, Distance modulus error, and position in galactic coordinates, but I havn't been able to find one that has all of that information (I have found several with some of the information, but not all of it). Does anyone know where I...

ESO recently announced its finding that a surprisingly high percentage of type O stars have companions [http://www.eso.org/public/news/eso1230/] . An equally surprising high percentage have 'vampiric' companions that feed off them, which appears to answer at least one hitherto puzzling...

I understand that our solar system was created from the ejected matter from a super nova. Is it possible to find the location of the black hole or neutron star that formed as a result of this super nova?

Here are my two questions: 1) When i look up to a night sky, do i see mostly stars and galaxy's rather then planets? Here is my logic: Since star is many many times more brighter then reflected light of planets i see brightest object and since we are looking form Earth planets and stars...

The frequency of supernovas in our galaxy is about one per century. Has there been a supernova in the Andromeda Galaxy in the last 200 years?

A9: Supernova Remnants Consider a supernova explosion in the outer 4M⊙ of a dying star, ejected at a speed of 5000 km/s. a ◮ What is the kinetic energy of the expanding ejecta? b ◮ The ejecta are slowed by sweeping up the local interstellar gas. Assuming the density of the interstellar gas...

Usual supernova 6 billion times brighter then ancestor star. Pair-instability supernova 100 times brighter then supernova 600 billion times brighter then ancestor star. If ancestor star apparent magnitude is 0 then apparent magnitude of pair-instability supernova from that star is = - 2.5*...

I was wondering if a shockwave from a supernova is finite or reacts as energy and dissipates over distance. The reason I'm asking is because I'm wondering if a supernova could give solarsystems, planets and basically anything with matter a nudge. Then could the objects in space act like a...

where does most of the energy arise in a type 2 supernova event? is it thermonuclear or the change form gravitiational energy to kinetic during the collapse? is the answer the same for a type 1 event.. thanks

supernova in 2241 bc?? do most astronomers agree that there should have been a supernova visible from Earth during this period but it wasnt documented

this is my first post-is there such a thing as an opposite of a supernova and what is hydrostatic equilibrium does it prevent a star from collapsing lastly what is the moon considered?

Forty years ago I went on a river trip in Utah's Canyon of Desolation. This is a five day trip with no roads or habitation the entire time. In the middle of the trip there is a prominent panel of petroglyphs. Over the years I went on that trip maybe four times and the memory of one of those...