A1 Refereed original research article in a scientific journal
Nebular phase observations of the Type-Ib supernova iPTF13bvn favour a binary progenitor
Authors: Kuncarayakti H, Maeda K, Bersten MC, Folatelli G, Morrell N, Hsiao EY, Gonzalez-Gaitan S, Anderson JP, Hamuy M, de Jaeger T, Gutierrez CP, Kawabata KS
Publisher: EDP SCIENCES S A
Publication year: 2015
Journal: Astronomy and Astrophysics
Journal name in source: ASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: ARTN A95
Volume: 579
Number of pages: 9
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201425604
Abstract
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.
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.
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