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Signatures of Delay...
Signatures of Delayed Detonation, Asymmetry, and Electron Capture in the Mid-Infrared Spectra of Supernovae 2003hv and 2005df
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Gerardy, Christopher L. (författare)
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Meikle, Peter (författare)
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Kotak, Rubina (författare)
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Höflich, Peter (författare)
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Farrah, Duncan (författare)
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Filippenko, Alexei V. (författare)
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Foley, Ryan J. (författare)
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- Lundqvist, Peter (författare)
- Stockholms universitet,Institutionen för astronomi
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Mattila, Seppo (författare)
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Pozzo, Monica (författare)
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- Sollerman, Jesper (författare)
- Stockholms universitet,Institutionen för astronomi
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Van Dyk, Schuyler D. (författare)
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Wheeler, J. Craig (författare)
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(creator_code:org_t)
- American Astronomical Society, 2007
- 2007
- Engelska.
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Ingår i: The Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 661:2, s. 995-1012
- Relaterad länk:
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http://authors.libra...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present mid-infrared (5.2-15.2 μm) spectra of the Type Ia supernovae (SNe Ia) 2003hv and 2005df observed with the Spitzer Space Telescope. These are the first observed mid-infrared spectra of thermonuclear supernovae, and show strong emission from fine-structure lines of Ni, Co, S, and Ar. The detection of Ni emission in SN 2005df 135 days after the explosion provides direct observational evidence of high-density nuclear burning forming a significant amount of stable Ni in a SN Ia. The SN 2005df Ar lines also exhibit a two-pronged emission profile, implying that the Ar emission deviates significantly from spherical symmetry. The spectrum of SN 2003hv also shows signs of asymmetry, exhibiting blueshifted [Co III], which matches the blueshift of [Fe II ] lines in nearly coeval near-infrared spectra. Finally, local thermodynamic equilibrium abundance estimates for the yield of radioactive 56Ni give M56Ni~0.5 Msolar, for SN 2003hv, but only M56Ni~0.13-0.22 Msolar for the apparently subluminous SN 2005df, supporting the notion that the luminosity of SNe Ia is primarily a function of the radioactive 56Ni yield. The observed emission-line profiles in the SN 2005df spectrum indicate a chemically stratified ejecta structure, which matches the predictions of delayed detonation (DD) models, but is entirely incompatible with current three-dimensional deflagration models. Furthermore, the degree that this layering persists to the innermost regions of the supernova is difficult to explain even in a DD scenario, where the innermost ejecta are still the product of deflagration burning. Thus, while these results are roughly consistent with a delayed detonation, it is clear that a key piece of physics is still missing from our understanding of the earliest phases of SN Ia explosions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Stars: Supernovae: General
- supernovae: individual (SN 2003hv)
- supernovae: individual (SN 2005df)
- Formation and development of stars
- Stjärnors bildning och utveckling
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Gerardy, Christo ...
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Meikle, Peter
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Kotak, Rubina
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Höflich, Peter
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Farrah, Duncan
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Filippenko, Alex ...
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visa fler...
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Foley, Ryan J.
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Lundqvist, Peter
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Mattila, Seppo
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Pozzo, Monica
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Sollerman, Jespe ...
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Van Dyk, Schuyle ...
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Wheeler, J. Crai ...
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visa färre...
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- NATURVETENSKAP
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och Fysik
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Stockholms universitet