arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.09298astro-ph.SR
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I型In超新星SN 2010 jl灭绝的尘埃模型

Dust Models for the Extinction of Type IIn Supernova SN 2010jl

Jun Li, Jian Gao, Biwei Jiang, Zesen Lin

摘要:

SN 2010 jl不寻常的消光曲线为研究核心坍缩超新星形成的尘埃的性质提供了绝佳的机会。利用一系列具有不同成分和粒度分布的尘埃模型拟合SN 2010 jl的消光曲线,发现具有指数截止幂律粒度分布特征的硅酸盐-石墨混合尘埃模型能够很好地再现SN 2010 jl的消光曲线。最佳拟合结果表明,由沙尘模型得到的观测值与各历元的观测值都是一致的。然而,总消光比$R_V$约为2.8 - 3.1,这是显着小于$R_V \approx 6.4$由Gall等人得出的值。最佳拟合模型表明,SN 2010 jl周围的尘埃颗粒可能是由小尺寸的天文硅酸盐颗粒和微米尺寸的石墨颗粒。此外,通过拟合光学到中红外光谱能量分布,我们发现SN 2010 jl周围的尘埃质量随着时间的推移而增加,在峰值亮度后1300天左右达到$0.005\,M_{\odot}$,这与之前的估计一致。

英文摘要:

The unusual extinction curves of SN 2010jl provide an excellent opportunity to investigate the properties of dust formed by core-collapse supernovae. By using a series of dust models with different compositions and grain size distributions, we fit the extinction curves of SN 2010jl and find that a silicate-graphite mixture dust model characterized by exponentially cutoff power-law size distributions can well reproduce its unusual extinction curves. The best-fit results show that the extinctions derived from the dust models are consistent with the observed values at all epochs. However, the total-to-selective extinction ratio $R_V$ is about 2.8 - 3.1, which is significantly smaller than the value of $R_V \approx 6.4$ derived by Gall et al. The best-fit models indicate that the dust grains around SN 2010jl are possibly composed of small-size astronomical silicate grains and micron-size graphite grains. In addition, by fitting the optical to mid-infrared spectral energy distribution, we find that the dust mass around SN 2010jl increases with time, up to $0.005\,M_{\odot}$ around 1300 days after peak brightness, which is consistent with previous estimates.

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