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Thread: Super Nova News

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    Default Super Nova News



    Super Explosive Stars Are Rare New Breed | Supernovas & Stellar Deaths | Space.com

    I was only aware of type Ia and type II supernova explosions. There seems to be a rarer type that is 10 times brighter than type Ia.

    Also, for those interested, a type II (believed to be) was recently observed and scientists are looking for / requesting photos. Cosmic Log - Images wanted of new supernova

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    Thanks, MJ. The newly-discovered rare supernova type is certainly interesting.

    For the recent type II supernova in M51, check out the Astrophotography forum. Several of us have imaged it.

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    Very nice pics Keith!

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    Always thought that there are 3 type of supernova

    Type 1A,Type II, and a hyper-nova.

    Type 1A is a white dwarf that has reached the Chandrasekhar limit - Wikipedia, the free encyclopedia stage

    Type II happens to stars 10-12 solar mass. It also will leave behind a neutron star.Which is a star composed of degenerate matter

    Type hyper-nova happens to stars that are 100 and more solar masses. It leaves behind a black hole.

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    Ah very cool, I had a dozen or so subs from the night of June 1st that I sent off to the email address in that link. Feels good to finally make a contribution to science!
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    Quote Originally Posted by somecdnguy View Post
    Ah very cool, I had a dozen or so subs from the night of June 1st that I sent off to the email address in that link. Feels good to finally make a contribution to science!
    Awesome! I knew someone here had to have imaged it at the right time.

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    Quote Originally Posted by heman90210 View Post
    Always thought that there are 3 type of supernova

    Type 1A,Type II, and a hyper-nova.

    Type 1A is a white dwarf that has reached the Chandrasekhar limit - Wikipedia, the free encyclopedia stage

    Type II happens to stars 10-12 solar mass. It also will leave behind a neutron star.Which is a star composed of degenerate matter

    Type hyper-nova happens to stars that are 100 and more solar masses. It leaves behind a black hole.
    Yes and no... There are 4 types of supernovas: Type II, Ia, Ib and Ic. A hypernova is basically a really really big core collapse supernova, but there is no formal, rigid definition of how big it has to be.

    To my knowledge, the reason the term hypernova exists and why it is interesting is that it is connected to gamma ray bursts. If you search the literature on hypernovae, most papers are mainly talking about long GRBs.

    I'm not an expert on hypernovae some some of what I'm about to say might be wrong. If I recall correctly, when a very massive star (e.g. 25 solar mases) explodes as a "normal" supernova, that's a hypernova. But some times the very massive star will have a very large iron core that gets in the way of the normal supernova explosion, so the material, instead of bouncing back like a supernova, continues to pile on and eventually gives a black hole. We can call this a "failed hypernova". Now the last bit: If in addition, the star is rotating rapidly and has lost the hydrogen envelope (this is what would normally cause a Type Ib supernova) instead of just failing normally, the rapid rotation creates an accretion disk around the black hole. The accretion disc ejects a large number of gamma rays in the axial direction, and if you are in the line of sight you observe this as a long gamma ray burst.

    There's probably some detail I got wrong, but the story above is basically correct. I studied this last year so some of the details are not entirely fresh in my mind.
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