The Cassiopeia A supernova was of type IIb |
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Authors: | Krause Oliver Birkmann Stephan M Usuda Tomonori Hattori Takashi Goto Miwa Rieke George H Misselt Karl A |
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Institution: | Max-Planck-Institut für Astronomie, K?nigstuhl 17, 69117 Heidelberg, Germany. krause@mpia.de |
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Abstract: | Cassiopeia A is the youngest supernova remnant known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supernova near maximum brightness, obtained from observations of a scattered light echo more than three centuries after the direct light of the explosion swept past Earth. The spectrum shows that Cassiopeia A was a type IIb supernova and originated from the collapse of the helium core of a red supergiant that had lost most of its hydrogen envelope before exploding. Our finding concludes a long-standing debate on the Cassiopeia A progenitor and provides new insight into supernova physics by linking the properties of the explosion to the wealth of knowledge about its remnant. |
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