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Direct Evidence of Two-component Ejecta in Supernova 2016gkg from Nebular Spectroscopy
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Kuncarayakti, Hanindyo (författare)
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Folatelli, Gastón (författare)
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Maeda, Keiichi (författare)
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Dessart, Luc (författare)
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- Jerkstrand, Anders (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Max-Planck-Institut für Astrophysik, Germany
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Anderson, Joseph P. (författare)
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Aoki, Kentaro (författare)
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Bersten, Melina C. (författare)
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Ferrari, Lucía (författare)
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Galbany, Lluís (författare)
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García, Federico (författare)
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Gutiérrez, Claudia P. (författare)
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Hattori, Takashi (författare)
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Kawabata, Koji S. (författare)
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Kravtsov, Timo (författare)
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Lyman, Joseph D. (författare)
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Mattila, Seppo (författare)
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E., Felipe Olivares (författare)
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Sánchez, Sebastián F. (författare)
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Van Dyk, Schuyler D. (författare)
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(creator_code:org_t)
- 2020-10-21
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 902:2
- Relaterad länk:
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https://iopscience.i...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- Spectral observations of the type-IIb supernova (SN) 2016gkg at 300-800 days are reported. The spectra show nebular characteristics, revealing emission from the progenitor star's metal-rich core and providing clues to the kinematics and physical conditions of the explosion. The nebular spectra are dominated by emission lines of [O i] lambda lambda 6300, 6364 and [Ca ii] lambda lambda 7292, 7324. Other notable, albeit weaker, emission lines include Mg I] lambda 4571, [Fe ii] lambda 7155, O I lambda 7774, Ca II triplet, and a broad, boxy feature at the location of H alpha. Unlike in other stripped-envelope SNe, the [O i] doublet is clearly resolved due to the presence of strong narrow components. The doublet shows an unprecedented emission line profile consisting of at least three components for each [O i]lambda 6300, 6364 line: a broad component (width similar to 2000 km s(-1)), and a pair of narrow blue and red components (width similar to 300 km s(-1)) mirrored against the rest velocity. The narrow component appears also in other lines, and is conspicuous in [O i]. This indicates the presence of multiple distinct kinematic components of material at low and high velocities. The low-velocity components are likely to be produced by a dense, slow-moving emitting region near the center, while the broad components are emitted over a larger volume. These observations suggest an asymmetric explosion, supporting the idea of two-component ejecta that influence the resulting late-time spectra and light curves. SN 2016gkg thus presents striking evidence for significant asymmetry in a standard-energy SN explosion. The presence of material at low velocity, which is not predicted in 1D simulations, emphasizes the importance of multidimensional explosion modeling of SNe.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Core-collapse supernovae
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
- Av författaren/redakt...
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Kuncarayakti, Ha ...
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Folatelli, Gastó ...
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Maeda, Keiichi
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Dessart, Luc
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Jerkstrand, Ande ...
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Anderson, Joseph ...
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visa fler...
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Aoki, Kentaro
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Bersten, Melina ...
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Ferrari, Lucía
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Galbany, Lluís
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García, Federico
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Gutiérrez, Claud ...
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Hattori, Takashi
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Kawabata, Koji S ...
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Kravtsov, Timo
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Lyman, Joseph D.
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Mattila, Seppo
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E., Felipe Oliva ...
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Sánchez, Sebasti ...
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Van Dyk, Schuyle ...
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
- Artiklar i publikationen
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Astrophysical Jo ...
- Av lärosätet
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Stockholms universitet