论文标题
SN 2016DSG：涉及厚氦壳的热核爆炸
SN 2016dsg: A Thermonuclear Explosion Involving A Thick Helium Shell
论文作者
论文摘要
预测，由于氦壳燃烧过程中产生的铁组元件，预测在碳 - 氧气白色矮人芯上的氦壳爆炸引起的热核爆炸被预测在早期覆盖。我们介绍了SN 2016DSG的光度法和光谱观察结果，这是一种与涉及厚He壳的热核爆炸一致的亚发光I型I型SN。以0.04的红移，$ i $ band Peak绝对幅度的得分约为-17.5。该物体远离其宿主，这是一个早期类型的银河系，这表明它起源于旧的恒星人口。峰后收集的光谱异常红色，显示出强的紫外线覆盖层和弱o $λ$ 7773的吸收线，并且在30天内不会显着发展。在近红外光谱中检测到的9700-10500ÅIS附近的吸收线可能是从喷射中的未燃烧的氦气中。光谱演化与具有厚氦壳的亚chandrasekhar质量白色矮人的热核爆炸模型一致，而现有模型的光度进化并未很好地描述。
A thermonuclear explosion triggered by a helium-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 helium-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a sub-luminous peculiar Type I SN 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 $λ$7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700-10500 Åis detected in the near-infrared spectrum and is likely from the unburnt helium in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar mass white dwarf with a thick helium shell, while the photometric evolution is not well described by existing models.
