TY - JOUR
T1 - SN 2016dsg
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.
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
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.
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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 -