PHOTOMETRIC AND SPECTROSCOPIC EVOLUTION OF THE IIP SN 2007it TO DAY 944

PHOTOMETRIC AND SPECTROSCOPIC EVOLUTION OF THE IIP SN 2007it TO DAY 944
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IIP SN 2007it 至第 944 天的光度和光谱演变

DOI:
10.1088/0004-637x/731/1/47
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发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Andrews J
Andrews J
中科院分区:
--
文献类型:
--
作者:
Andrews J

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SN 2007它是一颗明亮的IIP型超新星,显示出先前存在和新形成的尘埃。可见光光度计显示出明亮的晚期光度,由喷出物中存在的0.09 M的镍56提供动力。在第339天之后,光学亮度也会突然下降,而由于喷出物中形成了新的尘埃,红外线也会相应变亮。通常被认为是尘埃形成的前兆的CO和SiO排放可能已在SN 2007 it的中红外光度测定中检测到。光谱显示出强于平均[O i]发射线和弱于平均[Ca ii]线,这可能表明在预期的IIP型质量的高端有16-27 M的返祖。在光谱中也可以看到多组分[O i]线,这很可能是由SN爆炸期间喷射的氧核心材料的不对称斑点或圆环引起的。在第540天之前,与星周物质的相互作用可能在正向和反向冲击之间产生了一个冷的致密壳层,新的尘埃正在那里凝结。在后期,随着喷出物亮度的减弱,周围的光回波变得可见,可见光曲线也变得平坦。SN 2007 it光谱能量分布的辐射传输模型显示,在喷出物中形成了高达10− 4 M的新尘埃,这与其他核心坍缩超新星中形成的尘埃数量一致。
SN 2007it is a bright, Type IIP supernova which shows indications of both pre-existing and newly formed dust. The visible photometry shows a bright late-time luminosity, powered by the 0.09 M☉ of 56 Ni present in the ejecta. There is also a sudden drop in optical brightness after day 339, and a corresponding brightening in the IR due to new dust forming in the ejecta. CO and SiO emission, generally thought to be precursors to dust formation, may have been detected in the mid-IR photometry of SN 2007it. The optical spectra show stronger than average [O i] emission lines and weaker than average [Ca ii] lines, which may indicate a 16–27 M☉ progenitor, on the higher end of expected Type IIP masses. Multi-component [O i] lines are also seen in the optical spectra, most likely caused by an asymmetric blob or a torus of oxygen core material being ejected during the SN explosion. Interaction with circumstellar material prior to day 540 may have created a cool dense shell between the forward and reverse shocks where new dust is condensing. At late times there is also a flattening of the visible light curve as the ejecta luminosity fades and a surrounding light echo becomes visible. Radiative transfer models of SN 2007it spectral energy distributions indicate that up to 10− 4 M☉ of new dust has formed in the ejecta, which is consistent with the amount of dust formed in other core-collapse supernovae.
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