44 Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion
Science2015Vol. 348(6235), pp. 670–671
Citations Over TimeTop 10% of 2015 papers
Steven E. Boggs, Fiona A. Harrison, H. Miyasaka, Brian W. Grefenstette, Andreas Zoglauer, Chris L. Fryer, Stephen P. Reynolds, D. M. Alexander, Hongjun An, D. Barret, Finn E. Christensen, William W. Craig, Karl Förster, P. Giommi, Charles J. Hailey, A. Hornstrup, T. Kitaguchi, Jason E. Koglin, Kristin K. Madsen, P. H. Mao, Kaya Mori, M. Perri, M. J. Pivovaroff, Simonetta Puccetti, Vikram Rana, Daniel Stern, N. J. Westergaard, W. W. Zhang
Abstract
In core-collapse supernovae, titanium-44 ((44)Ti) 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.
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