почему белый налёт на языке у новорожденного ребенка
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почему белый налёт на языке у новорожденного ребенка, New evidence that some supernovae may be a “double detonation”, A star exploded twice — First-ever image reveals its cosmic , Massive 'double detonation' spotted by astronomers for the , Double detonation: new image shows remains of star destroyed , Astronomers Find Direct Evidence Of Elusive Double-Detonation , Calcium in a supernova remnant as a fingerprint of a sub , Double Detonation Supernova: Star’s Final Act Revealed.
That said, the two detonations involve the fusion of different elements, and therefore are going to end up producing different materials. "The detonations in the carbon-oxygen core and the helium-rich shell result in qualitatively different yield products," the researchers behind the new work write in a paper describing it. In the paper, they focus on calcium, which there are two ways of producing. One is from the outer shell of helium, via fusion before the detonation dilutes the material. A second batch of calcium is produced through the fusion of the core material as it's ejected in the supernova, which prevents further fusion events from converting it to even heavier elements. (Material deeper in the core does end up getting fused into heavier material.), Boom boom New evidence that some supernovae may be a “double detonation” It may be possible to blow up a white dwarf before it reaches a critical mass., Now, astronomers have captured a new image that proves their hunch was right: at least some Type Ia supernovae explode through a 'double-detonation' mechanism instead..
Some Type Ia supernovae explode through a “double-detonation” mechanism rather than just one. In this new model, the white dwarf forms a blanket of stolen helium around itself., For the first time, astronomers have obtained visual evidence that a star met its end by detonating twice. By studying the centuries-old remains of supernova SNR 0509-67.5 with the European Southern Observatory’s Very Large Telescope (ESO’s VLT), they have found patterns that confirm its star suffered a pair of explosive blasts. Published today, this discovery shows some of the most , Astronomers uncover the first direct evidence for how some white dwarf stars explode, confirming the long-debated double-detonation mechanism behind certain Type Ia supernovae., Here, we present new evidence—a spatially resolved ‘photographic snapshot’ of a double calcium shell—showing that SNe Ia can explode via the double-detonation mechanism., Astronomers confirm the first-ever Double Detonation Supernova, revealing a white dwarf star that exploded twice in a rare and dramatic cosmic event., .