Type IA Supernovae

en. A supernova is one way that a star can end its life, exploding in a display of grandiose fireworks. One family of supernovae, called Type Ia supernovae, are of particular interest in cosmology as they can be used as standard candles to measure distances in the Universe and so can be used to calibrate the accelerating expansion that is driven by dark energy. One defining characteristic of Type Ia supernovae is the lack of hydrogen in their spectrum. Yet hydrogen is the most common chemical element in the Universe. Such supernovae most likely arise in systems composed of two stars, one of them being the end product of the life of sun-like stars, or white dwarfs. When such white dwarfs, acting as stellar vampires that suck matter from their companion, become heavier than a given limit, they become unstable and explode.

Video credit: ESO
Original file downloaded from: http://www.eso.org/gallery/v/Videos/S...


tr. Üstnovalar, gösterişli bir patlama eşliğinde bir yıldızın ömrünü tamamlayış şekillerinden biridir. Üstnovalar çeşitlidirler ve bunlardan Ia türündekilerevrenbiliminde gökadakaların arasındaki uzaklıkların ölçülmesine ve cisimlerin birbirlerinden karanlık enerji sayesinde hangi oranlarda uzaklaştıklarının anlaşılmasına yardımcı olurlar. Ia türü üstnovaların en belirgin özelliklerinden biri elde edilen tayflarda hidrojen çizgilerinin bulunmuyor olmasıdır ki evrendeki en bol bulunan kimyasal element hidrojendir. Bu türdeki üstnovalar genelde ikili yıldız sistemlerinde görülür. Güneş benzeri bir yıldızın ömrünü tamamlayıp bir beyaz cüce türündeki çok yoğun ve küçük bir yıldıza dönüşür. Bu beyaz cüce yüksek güçlü manyetik alan ve çekim gücü sayesinde komşusu olan diğer yıldızdan bir vampir gibi sürekli madde emerek gittikçe ağırlaşır ve belirli bir sınırdan sonra yoğunluğu altında kararsız hale gelir ve patlar...

Video kaynağı: ESO
Dosyanın indirildiği bağlantı adresi: http://www.eso.org/gallery/v/Videos/S...

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[thiago keizo]

PTF11kly Super Nova IA in m101

[yoonoose]

exactly! :)

[JeremysRants]

IK Pegasi is only 150 LY from us and this will most likely happen when the primary star goes red giant. We need to be 3000 ly or farther to be safe

[yoonoose]

Yes! seems like a supernova radiation threat in near future (I mean millions of years :)) better to start to build a magnetic shield for the planet against the burst of high-energetic radiation.

[Pudgenello]

Thanks I have a bloody astrophysics test today. I should probably be studying though not on YouTube

[Attilavagyok100]

Gratulálok a Magyar csillagászat egyik legnagyobb felfedezőinek! Büszke vagyok rájuk.

[SuperGorpus]

Recent work seems to refute this. A "killer SN" needs to be within a few tens of light years. Search for "supernova danger Brian fields" (He has worked on this subject.)

[thiago keizo]

yes the other star survive only lost the serupefial area

[yoonoose]

good question. that first flash must represent a different burning or fusion process of elements from the collapsed gas and then when this runs off, it contracts and the core gets hotter for the actual fusion process for the explosion. First trigger for carbon element and then gets hotter for burning (fusing) the oxygen and goes on for heavier elements. These are what told in the "Type Ia supernova" entry in wikipedia, and I guess this seconds in the animation represent that steps.

[Benjamin Swan]

I was wondering, as the white dwarf is exploding, it brightens, dims and THEN explodes. Why is there that dip in brightness?