EVIDENCE FOR PRE-EXISTING DUST IN THE BRIGHT TYPE IIn SN 2010jl
EVIDENCE FOR PRE-EXISTING DUST IN THE BRIGHT TYPE IIn SN 2010jl
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DOI：
10.1088/0004-6256/142/2/45
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
J. Andrews;G. Clayton;R. Wesson;B. Sugerman;M. Barlow;J. Clem;B. Ercolano;J. Fabbri;J. Gallagher;A. Landolt;M. Meixner;M. Otsuka;D. Riebel;D. Welch
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文献类型：
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作者：
J. Andrews;G. Clayton;R. Wesson;B. Sugerman;M. Barlow;J. Clem;B. Ercolano;J. Fabbri;J. Gallagher;A. Landolt;M. Meixner;M. Otsuka;D. Riebel;D. Welch
SN 2010jl是一颗非常明亮的IIn型超新星，在爆炸后不到90天就显示出明显的红外（IR）过剩。我们获得了SN 2010j1爆炸后90天的Spitzer 3.6、4.5 μm和JHK观测结果。宿主星系几乎没有变红，这表明从祖先星系丢失的星周物质一定位于一个倾斜于天空平面之外的环面中。高中红外通量的可能原因是先前存在的星周尘埃对SN的初始闪光进行了再加工。使用三维蒙特卡罗辐射传输代码，我们估计在距离SN 6 × 1017厘米的环绕SN的星周环面中存在0.03到0.35 M☉的尘埃，并与天空平面倾斜60°到80°。在第90天，我们只看到这个环面大约5%的照明，预计在第450天之前，这种材料的红外通量会增加。这颗尘埃很可能是在一个发光的蓝变星（LBV）中产生的，它的质量损失超过3 M☉，它很大，但与船底座η星等其他LBV祖星一致。
SN 2010jl was an extremely bright, Type IIn supernova (SN) which showed a significant infrared (IR) excess no later than 90 days after explosion. We have obtained Spitzer 3.6 and 4.5 μm and JHK observations of SN 2010jl ∼90 days post-explosion. Little to no reddening in the host galaxy indicated that the circumstellar material lost from the progenitor must lie in a torus inclined out of the plane of the sky. The likely cause of the high mid-IR flux is the reprocessing of the initial flash of the SN by pre-existing circumstellar dust. Using a three-dimensional Monte Carlo radiative-transfer code, we have estimated that between 0.03 and 0.35 M☉ of dust exists in a circumstellar torus around the SN located 6 × 1017 cm away from the SN and inclined between 60° and 80° to the plane of the sky. On day 90, we are only seeing the illumination of approximately 5% of this torus, and expect to see an elevated IR flux from this material up until day ∼ 450. It is likely this dust was created in a luminous blue variable (LBV) like mass-loss event of more than 3 M☉, which is large but consistent with other LBV progenitors such as η Carinae.