Nebular phase observations of the type-Ib supernova iPTF13bvn favour a binary progenitor
Author
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Kuncarayakti, Hanindyo
Author
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Maeda, Keiichi
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Bersten, Melina Cecilia
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Folatelli, Gastón
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Morrell, Nidia
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Hsiao, Eric
Author
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González Gaitán, Santiago
Author
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Anderson, J. P.
Author
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Hamuy Wackenhut, Mario
Author
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De Jaeger, Thomas
Author
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Gutiérrez, C. P.
Author
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Kawabata, K. S.
Admission date
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2015-10-29T20:29:52Z
Available date
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2015-10-29T20:29:52Z
Publication date
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2015
Cita de ítem
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Astronomy & Astrophysics Volumen: 579 Número de artículo: A95 Jul 2015
en_US
Identifier
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10.1051/0004-6361/201425604
Identifier
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https://repositorio.uchile.cl/handle/2250/134770
General note
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Artículo de publicación ISI
en_US
Abstract
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Aims. We present and analyse late-time observations of the Type-Ib supernova with possible pre-supernova progenitor detection, iPTF13bvn, which were done similar to 300 days after the explosion. We discuss them in the context of constraints on the supernova's progenitor. Previous studies have proposed two possible natures for the progenitor of the supernova, i.e. a massive Wolf-Rayet star or a lower-mass star in a close binary system.
Methods. Our observations show that the supernova has entered the nebular phase, with the spectrum dominated by Mg I]lambda lambda 4571, [O I]lambda lambda 6300, 6364, and [Ca II]lambda lambda 7291, 7324 emission lines. We measured the emission line fluxes to estimate the core oxygen mass and compared the [O I]/[Ca II] line ratio with other supernovae.
Results. The core oxygen mass of the supernova progenitor was estimated to be less than or similar to 0.7 M-circle dot, which implies initial progenitor mass that does not exceed similar to 15-17 M-circle dot. Since the derived mass is too low for a single star to become a Wolf-Rayet star, this result lends more support to the binary nature of the progenitor star of iPTF13bvn. The comparison of [O I]/[Ca II] line ratio with other supernovae also shows that iPTF13bvn appears to be in close association with the lower mass progenitors of stripped-envelope and Type-II supernovae.
en_US
Patrocinador
dc.description.sponsorship
Ministry of Economy, Development, and Tourism's Millennium Science Initiative
IC120009
CONICYT through FONDECYT
3140563
3130680
Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)
23740141
26800100
WPI Initiative, MEXT, Japan
Danish Agency for Science and Technology and Innovation
National Aeronautics and Space Administration