Boggs, S. E.S. E.BoggsHarrison, F. A.F. A.HarrisonMiyasaka, H.H.MiyasakaGrefenstette, B. W.B. W.GrefenstetteZoglauer, A.A.ZoglauerFryer, C. L.C. L.FryerReynolds, S. P.S. P.ReynoldsAlexander, D. M.D. M.AlexanderAn, H.H.AnBarret, D.D.BarretChristensen, F. E.F. E.ChristensenCraig, W. W.W. W.CraigForster, K.K.ForsterGiommi, P.P.GiommiHailey, C. J.C. J.HaileyHornstrup, A.A.HornstrupKitaguchi, T.T.KitaguchiKoglin, J. E.J. E.KoglinMadsen, K. K.K. K.MadsenMao, P. H.P. H.MaoMori, K.K.MoriPERRI, MatteoMatteoPERRI0000-0003-3613-4409Pivovaroff, M. J.M. J.PivovaroffPuccetti, S.S.PuccettiRana, V.V.RanaStern, D.D.SternWestergaard, N. J.N. J.WestergaardZhang, W. W.W. W.Zhang2021-02-032021-02-0320150036-8075http://hdl.handle.net/20.500.12386/30182In 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.STAMPAenArticle10.1126/science.aaa22592-s2.0-84929118846000354045700039https://science.sciencemag.org/content/348/6235/6702015Sci...348..670BFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos