SIMBAD references

2022ApJ...934..102D - Astrophys. J., 934, 102 (2022/August-1)

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

DONG Y., VALENTI S., POLIN A., BOYLE A., FLORS A., VOGL C., KERZENDORF W.E., SAND D.J., JHA S.W., WYRZYKOWSKI L., BOSTROEM K.A., PEARSON J., McCULLY C., ANDREWS J.E., BENETTI S., BLONDIN S., GALBANY L., GROMADZKI M., HOSSEINZADEH G., HOWELL D.A., INSERRA C., JENCSON J.E., LUNDQUIST M., LYMAN J.D., MAGEE M., MAGUIRE K., MEZA N., SRIVASTAV S., TAUBENBERGER S., TERWEL J.H., WYATT S. and YOUNG D.R.

Abstract (from CDS):

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 Iλ7773 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.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Supernovae - Type Ia supernovae

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 12

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