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

Journal
SCIENCE
Date Issued
2015
Author(s)
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.
•
Forster, K.
•
Giommi, P.
•
Hailey, C. J.
•
Hornstrup, A.
•
Kitaguchi, T.
•
Koglin, J. E.
•
Madsen, K. K.
•
Mao, P. H.
•
Mori, K.
•
•
Pivovaroff, M. J.
•
Puccetti, S.
•
Rana, V.
•
Stern, D.
•
Westergaard, N. J.
•
Zhang, W. W.
DOI
10.1126/science.aaa2259
Abstract
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 ~700 kilometers per second, direct evidence of large-scale asymmetry in the explosion.
Volume
348
Issue
6235
Start page
670
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