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Modelling the Type Ic SN 2004aw: a moderately energetic explosion of a massive C+O star without a GRB

Mazzali, Paolo A. and Sauer, Daniel and Pian, Elena and Deng, Jinsong and Prentice, Simon and Ben Ami, S. and Taubenberger, Stefan and Nomoto, Ken (2017) Modelling the Type Ic SN 2004aw: a moderately energetic explosion of a massive C+O star without a GRB. Monthly Notices of the Royal Astronomical Society, 469 (2), pp. 2498-2508. Oxford University Press. DOI: 10.1093/mnras/stx992 ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnras/stx992


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. The ejected 56Ni mass is ≈0.20 M⊙. The ejecta mass as constrained by the models is ∼3–5 M⊙, while the kinetic energy is estimated as EK ∼3–6 × 1051 erg. The ratio EK/M⊙, the specific energy that influences the shape of the spectrum, is therefore ≈1. The corresponding zero-age main-sequence mass of the progenitor star may have been ∼23–28 M⊙. Tests show that a flatter outer density structure may have caused a broad-lined spectrum at epochs before those observed without affecting the later epochs when data are available, implying that our estimate of EK is a lower limit. SN 2004aw may have been powered by either a collapsar or a magnetar, both of which have been proposed for gamma-ray burst SNe. Evidence for this is seen in the innermost layers, which appear to be highly aspherical as suggested by the nebular line profiles. However, any engine was not extremely powerful, as the outer ejecta are more consistent with a spherical explosion and no gamma-ray burst was detected in coincidence with SN 2004aw.

Item URL in elib:https://elib.dlr.de/115823/
Document Type:Article
Title:Modelling the Type Ic SN 2004aw: a moderately energetic explosion of a massive C+O star without a GRB
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mazzali, Paolo A.Astrophysics Research Institute, Liverpool John Moores UniversityUNSPECIFIED
Sauer, Danieldlr, ipahttps://orcid.org/0000-0002-0317-5063
Pian, ElenaScuola Normale Superiore, PisaUNSPECIFIED
Deng, JinsongNational Astronomical Observatories, ChinaUNSPECIFIED
Prentice, SimonAstrophysics Research Institute, Liverpool John Moores UniversityUNSPECIFIED
Ben Ami, S.Smithsonian Astrophysical Observatory, USAUNSPECIFIED
Taubenberger, StefanMax-Planck-Institut für Astrophysik, GermanyUNSPECIFIED
Date:28 April 2017
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1093/mnras/stx992
Page Range:pp. 2498-2508
Publisher:Oxford University Press
Keywords:line: formation – line: identification – radiative transfer – gamma-ray burst: gen- eral – supernovae: general – supernovae: individual: SN 2004aw
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Sauer, Dr. Daniel
Deposited On:22 Nov 2017 13:34
Last Modified:06 Sep 2019 15:17

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