SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell

Yize Dong; Stefano Valenti; Abigail Polin; Aoife Boyle; Andreas Flörs; Christian Vogl; Wolfgang E. Kerzendorf; David J. Sand; Saurabh W. Jha; Łukasz Wyrzykowski; K. Azalee Bostroem; Jeniveve Pearson; Curtis McCully; Jennifer E. Andrews; Stefano Benetti; Stéphane Blondin; L. Galbany; Mariusz Gromadzki; Griffin Hosseinzadeh; D. Andrew Howell; Cosimo Inserra; Jacob E. Jencson; Michael Lundquist; J. D. Lyman; Mark Magee; Kate Maguire; Nicolas Meza; Shubham Srivastav; Stefan Taubenberger; J. H. Terwel; Samuel Wyatt; D. R. Young

doi:10.3847/1538-4357/ac75eb

SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell

Yize Dong
, Stefano Valenti
, Abigail Polin
, Aoife Boyle
, Andreas Flörs
, Christian Vogl
, Wolfgang E. Kerzendorf
, David J. Sand
, Saurabh W. Jha
, Łukasz Wyrzykowski
, K. Azalee Bostroem
, Jeniveve Pearson
, Curtis McCully
, Jennifer E. Andrews
, Stefano Benetti
, Stéphane Blondin
, L. Galbany
, Mariusz Gromadzki
, Griffin Hosseinzadeh
, D. Andrew Howell

Cosimo Inserra, Jacob E. Jencson, Michael Lundquist, J. D. Lyman, Mark Magee, Kate Maguire, Nicolas Meza, Shubham Srivastav, Stefan Taubenberger, J. H. Terwel, Samuel Wyatt, D. R. Young

Astronomy

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

A thermonuclear explosion triggered by a He-shell detonation on a carbon-oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around −17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak O i λ7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500 Å is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.

Original language	English (US)
Article number	102
Journal	Astrophysical Journal
Volume	934
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ac75eb
State	Published - Aug 1 2022

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ac75eb

Cite this

Dong, Y., Valenti, S., Polin, A., Boyle, A., Flörs, A., Vogl, C., Kerzendorf, W. E., Sand, D. J., Jha, S. W., Wyrzykowski, Ł., Bostroem, K. A., Pearson, J., McCully, C., Andrews, J. E., Benetti, S., Blondin, S., Galbany, L., Gromadzki, M., Hosseinzadeh, G., ... Young, D. R. (2022). SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell. Astrophysical Journal, 934(2), Article 102. https://doi.org/10.3847/1538-4357/ac75eb

Dong, Y, Valenti, S, Polin, A, Boyle, A, Flörs, A, Vogl, C, Kerzendorf, WE, Sand, DJ, Jha, SW, Wyrzykowski, Ł, Bostroem, KA, Pearson, J, McCully, C, Andrews, JE, Benetti, S, Blondin, S, Galbany, L, Gromadzki, M, Hosseinzadeh, G, Howell, DA, Inserra, C, Jencson, JE, Lundquist, M, Lyman, JD, Magee, M, Maguire, K, Meza, N, Srivastav, S, Taubenberger, S, Terwel, JH, Wyatt, S & Young, DR 2022, 'SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell', Astrophysical Journal, vol. 934, no. 2, 102. https://doi.org/10.3847/1538-4357/ac75eb

@article{8566984d7c9045ca990027b90ee4e35b,

title = "SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell",

abstract = "A thermonuclear explosion triggered by a He-shell detonation on a carbon-oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around −17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak O i λ7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500 {\AA} is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.",

author = "Yize Dong and Stefano Valenti and Abigail Polin and Aoife Boyle and Andreas Fl{\"o}rs and Christian Vogl and Kerzendorf, \{Wolfgang E.\} and Sand, \{David J.\} and Jha, \{Saurabh W.\} and {\L}ukasz Wyrzykowski and Bostroem, \{K. Azalee\} and Jeniveve Pearson and Curtis McCully and Andrews, \{Jennifer E.\} and Stefano Benetti and St{\'e}phane Blondin and L. Galbany and Mariusz Gromadzki and Griffin Hosseinzadeh and Howell, \{D. Andrew\} and Cosimo Inserra and Jencson, \{Jacob E.\} and Michael Lundquist and Lyman, \{J. D.\} and Mark Magee and Kate Maguire and Nicolas Meza and Shubham Srivastav and Stefan Taubenberger and Terwel, \{J. H.\} and Samuel Wyatt and Young, \{D. R.\}",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = aug,

day = "1",

doi = "10.3847/1538-4357/ac75eb",

language = "English (US)",

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T2 - A Thermonuclear Explosion Involving a Thick Helium Shell

AU - Dong, Yize

AU - Valenti, Stefano

AU - Polin, Abigail

AU - Boyle, Aoife

AU - Flörs, Andreas

AU - Vogl, Christian

AU - Kerzendorf, Wolfgang E.

AU - Sand, David J.

AU - Jha, Saurabh W.

AU - Wyrzykowski, Łukasz

AU - Bostroem, K. Azalee

AU - Pearson, Jeniveve

AU - McCully, Curtis

AU - Andrews, Jennifer E.

AU - Benetti, Stefano

AU - Blondin, Stéphane

AU - Galbany, L.

AU - Gromadzki, Mariusz

AU - Hosseinzadeh, Griffin

AU - Howell, D. Andrew

AU - Inserra, Cosimo

AU - Jencson, Jacob E.

AU - Lundquist, Michael

AU - Lyman, J. D.

AU - Magee, Mark

AU - Maguire, Kate

AU - Meza, Nicolas

AU - Srivastav, Shubham

AU - Taubenberger, Stefan

AU - Terwel, J. H.

AU - Wyatt, Samuel

AU - Young, D. R.

PY - 2022/8/1

Y1 - 2022/8/1

N2 - A thermonuclear explosion triggered by a He-shell detonation on a carbon-oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around −17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak O i λ7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500 Å is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.

AB - A thermonuclear explosion triggered by a He-shell detonation on a carbon-oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around −17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak O i λ7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500 Å is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.

UR - https://www.scopus.com/pages/publications/85135443109

UR - https://www.scopus.com/pages/publications/85135443109#tab=citedBy

U2 - 10.3847/1538-4357/ac75eb

DO - 10.3847/1538-4357/ac75eb

M3 - Article

AN - SCOPUS:85135443109

SN - 0004-637X

VL - 934

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 102

ER -

SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell

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Follow-up LCO photometry & spectra of SN 2016dsg

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SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell

Abstract

ASJC Scopus subject areas

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Datasets

Follow-up LCO photometry &amp; spectra of SN 2016dsg

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Follow-up LCO photometry & spectra of SN 2016dsg