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

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.; Perri, M.; Pivovaroff, M.J.; Puccetti, S.; Rana, V.; Stern, D.; Westergaard, N.J.; Zhang, W.W.

Abstract

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.

Citation

Boggs, S., Harrison, F., Miyasaka, H., Grefenstette, B., Zoglauer, A., Fryer, C., …Zhang, W. (2015). 44Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion. Science, 348(6235), 670-671. https://doi.org/10.1126/science.aaa2259

• Journal Article Type: Article
• Acceptance Date: Apr 8, 2015
• Publication Date: May 8, 2015
• Deposit Date: May 15, 2015
• Journal: Science
• Print ISSN: 0036-8075
• Electronic ISSN: 1095-9203
• Publisher: American Association for the Advancement of Science
• Peer Reviewed: Peer Reviewed
• Volume: 348
• Issue: 6235
• Pages: 670-671
• DOI: https://doi.org/10.1126/science.aaa2259
• Public URL: https://durham-repository.worktribe.com/output/1408244
• Related Public URLs: http://adsabs.harvard.edu/abs/2015Sci...348..670B