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Early Ni-56 decay g...
Early Ni-56 decay gamma rays from SN2014J suggest an unusual explosion
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Diehl, Roland (author)
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Siegert, Thomas (author)
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Hillebrandt, Wolfgang (author)
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Grebenev, Sergei A. (author)
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Greiner, Jochen (author)
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Krause, Martin (author)
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- Kromer, Markus (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Maeda, Keiichi (author)
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Roepke, Friedrich (author)
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Taubenberger, Stefan (author)
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(creator_code:org_t)
- American Association for the Advancement of Science (AAAS), 2014
- 2014
- English.
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In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 345:6201, s. 1162-1165
- Related links:
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https://repository.k...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Type Ia supernovae result from binary systems that include a carbon-oxygen white dwarf, and these thermonuclear explosions typically produce 0.5 solar mass of radioactive Ni-56. The Ni-56 is commonly believed to be buried deeply in the expanding supernova cloud. In SN2014J, we detected the lines at 158 and 812 kiloelectron volts from Ni-56 decay (time similar to 8.8 days) earlier than the expected several-week time scale, only similar to 20 days after the explosion and with flux levels corresponding to roughly 10% of the total expected amount of Ni-56. Some mechanism must break the spherical symmetry of the supernova and at the same time create a major amount of Ni-56 at the outskirts. A plausible explanation is that a belt of helium from the companion star is accreted by the white dwarf, where this material explodes and then triggers the supernova event.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Diehl, Roland
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Siegert, Thomas
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Hillebrandt, Wol ...
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Grebenev, Sergei ...
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Greiner, Jochen
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Krause, Martin
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show more...
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Kromer, Markus
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Maeda, Keiichi
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Roepke, Friedric ...
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Taubenberger, St ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Science
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Stockholm University