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dc.contributor.author
Kuncarayakti, Hanindyo
dc.contributor.author
Folatelli, Gaston
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Maeda, Keiichi
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Dessart, Luc
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Jerkstrand, Anders
dc.contributor.author
Anderson, Joseph
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Aoki, Kentaro
dc.contributor.author
Bersten, Melina Cecilia
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Ferrari, Lucía
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Galbany, Lluís
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García, Federico
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Gutiérrez, Claudia P.
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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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Felipe Olivares, E.
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Sánchez, Sebastian F.
dc.contributor.author
Van Dyk, Schuyler D.
dc.date.available
2021-11-26T18:01:21Z
dc.date.issued
2020-10
dc.identifier.citation
Kuncarayakti, Hanindyo; Folatelli, Gaston; Maeda, Keiichi; Dessart, Luc; Jerkstrand, Anders; et al.; Direct Evidence of Two-component Ejecta in Supernova 2016gkg from Nebular Spectroscopy; IOP Publishing; Astrophysical Journal; 902; 2; 10-2020; 1-20
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/147537
dc.description.abstract
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] λλ6300, 6364 and [Ca ii] λλ7292, 7324. Other notable, albeit weaker, emission lines include Mg I] λ4571, [Fe ii] λ7155, O I λ7774, Ca II triplet, and a broad, boxy feature at the location of Hα. 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]λ6300, 6364 line: a broad component (width ∼2000 km s-1), and a pair of narrow blue and red components (width ∼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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Core-collapse supernovae
dc.subject
Solar and Stellar Astrophysics
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supernovae: general
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supernovae: individual (SN 2016gkg)
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stars: massive
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stars: interiors
dc.subject.classification
Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Direct Evidence of Two-component Ejecta in Supernova 2016gkg from Nebular Spectroscopy
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-07-01T14:50:30Z
dc.journal.volume
902
dc.journal.number
2
dc.journal.pagination
1-20
dc.journal.pais
Reino Unido
dc.description.fil
Fil: Kuncarayakti, Hanindyo. Tuorla Observatory; Finlandia
dc.description.fil
Fil: Folatelli, Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Maeda, Keiichi. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
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Fil: Dessart, Luc. Sorbonne Université; Francia
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Fil: Jerkstrand, Anders. Stockholm University; Suecia
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Fil: Anderson, Joseph. European Southern Observatory Chile; Chile
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Fil: Aoki, Kentaro. National Astronomical Observatory of Japan; Japón
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Fil: Bersten, Melina Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Ferrari, Lucía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Galbany, Lluís. Universidad de Granada; España
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Fil: García, Federico. University of Groningen; Países Bajos
dc.description.fil
Fil: Gutiérrez, Claudia P.. University of Southampton; Reino Unido
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Fil: Hattori, Takashi. National Astronomical Observatory of Japan; Japón
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Fil: Kawabata, Koji S.. Hiroshima University; Japón
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Fil: Kravtsov, Timo. University of Turku; Finlandia
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Fil: Lyman, Joseph D.. University of Warwick; Reino Unido
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Fil: Mattila, Seppo. University of Turku; Finlandia
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Fil: Felipe Olivares, E.. Universidad de Atacama; Chile
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Fil: Sánchez, Sebastian F.. Universidad Nacional Autónoma de México; México
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Fil: Van Dyk, Schuyler D.. Caltech/IPAC; Estados Unidos
dc.journal.title
Astrophysical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/abb4e7
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