Journal
SCIENCE
Volume 348, Issue 6235, Pages 670-671Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa2259
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Funding
- NASA [NNG08FD60C]
- National Aeronautics and Space Administration
- French Space Agency (CNES)
- Japan Society for the Promotion of Science [24740185]
- Technical University of Denmark
- Science and Technology Facilities Council [ST/L00075X/1] Funding Source: researchfish
- STFC [ST/L00075X/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [24740185] Funding Source: KAKEN
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In core-collapse supernovae, titanium-44 (Ti-44) is produced in the innermost ejecta, in the layer of material directly on top of the newly formed compact object. As such, it provides a direct probe of the supernova engine. Observations of supernova 1987A (SN1987A) have resolved the 67.87- and 78.32-kilo-electron volt emission lines from decay of Ti-44 produced in the supernova explosion. These lines are narrow and redshifted with a Doppler velocity of similar to 700 kilometers per second, direct evidence of large-scale asymmetry in the explosion.
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