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

S. E. Boggs, F. A. Harrison, H. Miyasaka, B. W. Grefenstette, A. Zoglauer, C. L. Fryer, S. P. Reynolds, D. M. Alexander, H. An, D. Barret, Finn Erland Christensen, W. W. Craig, Allan Hornstrup, Niels Jørgen Stenfeldt Westergaard

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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 44Ti 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.
Original languageEnglish
Issue number6235
Pages (from-to)670-671
Publication statusPublished - 2015


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Boggs, S. E., Harrison, F. A., Miyasaka, H., Grefenstette, B. W., Zoglauer, A., Fryer, C. L., Reynolds, S. P., Alexander, D. M., An, H., Barret, D., Christensen, F. E., Craig, W. W., Hornstrup, A., & Westergaard, N. J. S. (2015). 44Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion. Science, 348(6235), 670-671. https://doi.org/10.1126/science.aaa2259