THE EVOLUTION OF DUST MASS IN THE EJECTA OF SN 1987A

THE EVOLUTION OF DUST MASS IN THE EJECTA OF SN 1987A
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SN 1987A 喷射物中尘埃质量的演变

DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
R. Arendt
R. Arendt
中科院分区:
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文献类型:
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作者:
E. Dwek;R. Arendt

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我们对 SN 1987A 喷射物的红外 (IR) 发射进行了新的分析,涵盖爆炸后第 615、775、1144、8515 和 9090 天。我们表明,观测结果与在第 615 天左右快速形成约 0.4 M ⊙ ?> 尘埃(主要由硅酸盐(MgSiO3)组成)一致,并在 ∼8500 天后演变成约 0.45 M ⊙ ?> 复合尘埃颗粒,由 ∼0.4 M ⊙ ?> 硅酸盐和 ∼0.05 M ⊙ ?> 无定形碳组成。所提出的情景挑战了之前的主张,即超新星(SN)喷射物中的尘埃主要是碳,并且它通过冷吸积从初始质量~10−3 M ⊙ ?> 增长到超过 0.5 M ⊙ ?> 。它缓解了先前数据解释中的几个问题:(1)它使硅、镁和碳的丰度与核合成计算所施加的上限相一致,(2)它消除了第 9000 天左右观察到的大部分尘埃是通过冷吸积生长到先前推断的爆炸后第 615 天和 775 天尘埃的~10−3 M ⊙ ?> 的要求,以及(3)确立了主导地位SN 喷射物中的硅酸盐覆盖碳尘。在早期,尘埃的红外光度由 56Co 的放射性衰变提供动力,而在晚期,至少由 44Ti 的 (1.3–1.6) × 10−4 M ⊙ ?> 提供动力。
We present a new analysis of the infrared (IR) emission from the ejecta of SN 1987A covering days 615, 775, 1144, 8515, and 9090 after the explosion. We show that the observations are consistent with the rapid formation of about 0.4 M ⊙ ?> of dust, consisting of mostly silicates (MgSiO3), near day 615, and evolving to about 0.45 M ⊙ ?> of composite dust grains consisting of ∼0.4 M ⊙ ?> of silicates and ∼0.05 M ⊙ ?> of amorphous carbon after day ∼8500. The proposed scenario challenges previous claims that dust in supernova (SN) ejecta is predominantly carbon, and that it grew from an initial mass of ∼10−3 M ⊙ ?> , to over 0.5 M ⊙ ?> by cold accretion. It alleviates several problems with previous interpretations of the data: (1) it reconciles the abundances of silicon, magnesium, and carbon with the upper limits imposed by nucleosynthesis calculations, (2) it eliminates the requirement that most of the dust observed around day 9000 grew by cold accretion onto the ∼10−3 M ⊙ ?> of dust previously inferred for days 615 and 775 after the explosion, and (3) establishes the dominance of silicate over carbon dust in the SN ejecta. At early epochs, the IR luminosity of the dust is powered by the radioactive decay of 56Co, and at late times by at least (1.3–1.6) × 10−4 M ⊙ ?> of 44Ti.
DOI: 10.1111/j.1365-2966.2006.11336.x
发表时间: 2006-11
影响因子: 4.8
作者:
B. Ercolano;M. Barlow;B. Sugerman
通讯作者: B. Ercolano;M. Barlow;B. Sugerman
勘误:块状超新星壳中的尘埃产量:SN 1987A 重新审视
DOI: 10.1111/j.1365-2966.2007.11994.x
发表时间: 2007
影响因子: 4.8
作者:
Ercolano B
通讯作者: Ercolano B