Modelling the Type Ic SN 2004Aw: a Moderately Energetic Explosion of a Massive C+O Star Without a GRB
MNRAS 469, 2498–2508 (2017) doi:10.1093/mnras/stx992 Advance Access publication 2017 April 28 Modelling the Type Ic SN 2004aw: a moderately energetic explosion of a massive C+O star without a GRB P. A. Mazzali,1,2‹ D. N. Sauer,3 E. Pian,4,5 J. Deng,6 S. Prentice,1 S. Ben Ami,7 S. Taubenberger2,8 and K. Nomoto9 1Astrophysics Research Institute, Liverpool John Moores University, IC2, 134 Brownlow Hill, Liverpool L3 5RF, UK 2Max-Planck-Institut fur¨ Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching bei Munchen,¨ Germany 3German Aerospace Center (DLR), Institute of Atmospheric Physics, D-82234 Oberpfaffenhofen, Germany 4IASF-Bo, via Gobetti 101, I-40129 Bologna, Italy 5Scuola Normale Superiore, Piazza dei Cavalieri, 7, I-56126 Pisa, Italy 6National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, Beijing 100012, China 7Smithsonian Astrophysical Observatory, 60 Garden St., Cambridge, MA 02138, USA 8European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei Munchen,¨ Germany 9IPMU, Kashiwa, 277-8583, Japan Accepted 2017 April 21. Received 2017 April 20; in original form 2017 March 10 ABSTRACT An analysis of the Type Ic supernova (SN) 2004aw is performed by means of models of the photospheric and nebular spectra and of the bolometric light curve. SN 2004aw is shown not to be ‘broad-lined’, contrary to previous claims, but rather a ‘fast-lined’ SN Ic. The spectral resemblance to the narrow-lined Type Ic SN 1994I, combined with the strong nebular [O I] emission and the broad light curve, points to a moderately energetic explosion of a massive C+O star.
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