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Type Ibn supernovae show photometric homogeneity and spectral diversity at maximum light

Type Ibn supernovae show photometric homogeneity and spectral diversity at maximum light
Type Ibn supernovae show photometric homogeneity and spectral diversity at maximum light
Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrogen. The prevailing theory has been that these are the core-collapse explosions of very massive stars embedded in helium-rich circumstellar material (CSM). We report optical observations of six new SNe Ibn: PTF11rfh, PTF12ldy, iPTF14aki, iPTF15ul, SN 2015G, and iPTF15akq. This brings the sample size of such objects in the literature to 22. We also report new data, including a near-infrared spectrum, on the Type Ibn SN 2015U. In order to characterize the class as a whole, we analyze the photometric and spectroscopic properties of the full Type Ibn sample. We find that, despite the expectation that CSM interaction would generate a heterogeneous set of light curves, as seen in SNe IIn, most Type Ibn light curves are quite similar in shape, declining at rates around 0.1 mag day-1 during the first month after maximum light, with a few significant exceptions. Early spectra of SNe Ibn come in at least two varieties, one that shows narrow P Cygni lines and another dominated by broader emission lines, both around maximum light, which may be an indication of differences in the state of the progenitor system at the time of explosion. Alternatively, the spectral diversity could arise from viewing-angle effects or merely from a lack of early spectroscopic coverage. Together, the relative light curve homogeneity and narrow spectral features suggest that the CSM consists of a spatially confined shell of helium surrounded by a less dense extended wind.
supernovae: general, supernovae: individual: PTF11rfh, PTF12ldy, iPTF14aki, SN 2015U, iPTF15ul, SN 2015G, iPTF15akq
0004-637X
1-22
Hosseinzadeh, Griffin
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Arcavi, Iair
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Valenti, Stefano
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McCully, Curtis
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Fox, Ori D.
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Fremling, Christoffer
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Horesh, Assaf
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Taddia, Francesco
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Gal-Yam, Avishay
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Sullivan, Mark
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Woźniak, Przemek
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Hosseinzadeh, Griffin
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Arcavi, Iair
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Valenti, Stefano
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McCully, Curtis
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Cao, Yi
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Taddia, Francesco
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Smartt, Stephen
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Smith, Ken W.
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Sullivan, Mark
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Surace, Jason
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Hosseinzadeh, Griffin, Arcavi, Iair, Valenti, Stefano, McCully, Curtis, Howell, D. Andrew, Johansson, Joel, Sollerman, Jesper, Pastorello, Andrea, Benetti, Stefano, Cao, Yi, Cenko, S. Bradley, Clubb, Kelsey I., Corsi, Alessandra, Duggan, Gina, Elias-Rosa, Nancy, Filippenko, Alexei V., Fox, Ori D., Fremling, Christoffer, Horesh, Assaf, Karamehmetoglu, Emir, Kasliwal, Mansi, Marion, G.H., Ofek, Eran, Sand, David, Taddia, Francesco, Zheng, WeiKang, Fraser, Morgan, Gal-Yam, Avishay, Inserra, Cosimo, Laher, Russ, Masci, Frank, Rebbapragada, Umaa, Smartt, Stephen, Smith, Ken W., Sullivan, Mark, Surace, Jason and Woźniak, Przemek (2017) Type Ibn supernovae show photometric homogeneity and spectral diversity at maximum light. The Astrophysical Journal, 836 (2), 1-22. (doi:10.3847/1538-4357/836/2/158).

Record type: Article

Abstract

Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrogen. The prevailing theory has been that these are the core-collapse explosions of very massive stars embedded in helium-rich circumstellar material (CSM). We report optical observations of six new SNe Ibn: PTF11rfh, PTF12ldy, iPTF14aki, iPTF15ul, SN 2015G, and iPTF15akq. This brings the sample size of such objects in the literature to 22. We also report new data, including a near-infrared spectrum, on the Type Ibn SN 2015U. In order to characterize the class as a whole, we analyze the photometric and spectroscopic properties of the full Type Ibn sample. We find that, despite the expectation that CSM interaction would generate a heterogeneous set of light curves, as seen in SNe IIn, most Type Ibn light curves are quite similar in shape, declining at rates around 0.1 mag day-1 during the first month after maximum light, with a few significant exceptions. Early spectra of SNe Ibn come in at least two varieties, one that shows narrow P Cygni lines and another dominated by broader emission lines, both around maximum light, which may be an indication of differences in the state of the progenitor system at the time of explosion. Alternatively, the spectral diversity could arise from viewing-angle effects or merely from a lack of early spectroscopic coverage. Together, the relative light curve homogeneity and narrow spectral features suggest that the CSM consists of a spatially confined shell of helium surrounded by a less dense extended wind.

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Ibn_paper_v3.5 - Accepted Manuscript
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Accepted/In Press date: 31 August 2016
e-pub ahead of print date: 16 February 2017
Published date: 20 February 2017
Keywords: supernovae: general, supernovae: individual: PTF11rfh, PTF12ldy, iPTF14aki, SN 2015U, iPTF15ul, SN 2015G, iPTF15akq

Identifiers

Local EPrints ID: 413356
URI: https://eprints.soton.ac.uk/id/eprint/413356
ISSN: 0004-637X
PURE UUID: 19e6e912-4429-4cb5-a9e7-7a4fa7c7a9dc
ORCID for Cosimo Inserra: ORCID iD orcid.org/0000-0002-3968-4409
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 22 Aug 2017 16:31
Last modified: 14 Mar 2019 01:35

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Contributors

Author: Griffin Hosseinzadeh
Author: Iair Arcavi
Author: Stefano Valenti
Author: Curtis McCully
Author: D. Andrew Howell
Author: Joel Johansson
Author: Jesper Sollerman
Author: Andrea Pastorello
Author: Stefano Benetti
Author: Yi Cao
Author: S. Bradley Cenko
Author: Kelsey I. Clubb
Author: Alessandra Corsi
Author: Gina Duggan
Author: Nancy Elias-Rosa
Author: Alexei V. Filippenko
Author: Ori D. Fox
Author: Christoffer Fremling
Author: Assaf Horesh
Author: Emir Karamehmetoglu
Author: Mansi Kasliwal
Author: G.H. Marion
Author: Eran Ofek
Author: David Sand
Author: Francesco Taddia
Author: WeiKang Zheng
Author: Morgan Fraser
Author: Avishay Gal-Yam
Author: Cosimo Inserra ORCID iD
Author: Russ Laher
Author: Frank Masci
Author: Umaa Rebbapragada
Author: Stephen Smartt
Author: Ken W. Smith
Author: Mark Sullivan ORCID iD
Author: Jason Surace
Author: Przemek Woźniak

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