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Published May 8, 2015 | Supplemental Material
Journal Article Open

⁴⁴Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion


In core-collapse supernovae, titanium-44 (⁴⁴Ti) 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 ^(44)Ti produced in the supernova explosion. These lines are narrow and redshifted with a Doppler velocity of ~700 kilometers per second, direct evidence of large-scale asymmetry in the explosion.

Additional Information

© 2015 American Association for the Advancement of Science. Received 3 November 2014; accepted 8 April 2015. This work was supported under NASA Contract no. NNG08FD60C and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). D.B. acknowledges funding from the French Space Agency (CNES). T.K. was supported by Japan Society for the Promotion of Science Grant-in-Aid for Young Scientists (B) (no. 24740185). N.J.W. acknowledges funding from the Technical University of Denmark. NuSTAR data are accessible from NASA's High Energy Astrophysics Science Archive Research Center (HEASARC, http://heasarc.gsfc.nasa.gov/).

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