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arXiv 1409.0700astro-ph.SRastro-ph.COastro-ph.GAastro-ph.HE
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超新星2011 dh位置的蓝点源

A Blue Point Source at the Location of Supernova 2011dh

Gastón Folatelli, Melina C. Bersten, Omar G. Benvenuto, Schuyler D. Van Dyk, Hanindyo Kuncarayakti, Keiichi Maeda, Takaya Nozawa, Ken'ichi Nomoto, Mario Hamuy, Robert M. Quimby

摘要:

我们介绍了哈勃太空望远镜(HST)对M51中的IIb型超新星(SN)2011 dh的观测,使用宽视场相机3和近紫外滤光片F225 W和F336 W在爆炸后约1161个静止帧天进行。在两个波段都检测到一个星形物体,光度测定表明它具有负(F225 W-F336 W)颜色。观测到的物体与相互作用双星模型中预测的现已消失的黄色超巨星祖先的伴星兼容。我们认为SN不太可能发生强相互作用,因此估计它对观测到的通量有很小的贡献。已检测到一个未解决的光回波或一个无关的对象的可能性进行了简要讨论,并判断不太可能。采用一个可能的范围内的消光尘埃,我们约束参数的建议的二元系统。特别是,如果新形成的尘埃没有产生明显的消光,那么双星伴星的质量吸积效率必须低于50%。还需要进一步的多波段观测,以确认该物体是否为伴星。如果得到证实,伴星将已经在紫外/光学区域占主导地位,因此它将很容易提供一个独特的机会来对其特性进行详细研究。

英文摘要:

We present Hubble Space Telescope (HST) observations of the field of the Type IIb supernova (SN) 2011dh in M51 performed at ~1161 rest-frame days after explosion using the Wide Field Camera 3 and near-UV filters F225W and F336W. A star-like object is detected in both bands and the photometry indicates it has negative (F225W - F336W) color. The observed object is compatible with the companion of the now-vanished yellow supergiant progenitor predicted in interacting binary models. We consider it unlikely that the SN is undergoing strong interaction and thus estimate that it makes a small contribution to the observed flux. The possibilities of having detected an unresolved light echo or an unrelated object are briefly discussed and judged unlikely. Adopting a possible range of extinction by dust, we constrain parameters of the proposed binary system. In particular, the efficiency of mass accretion onto the binary companion must be below 50%, if no significant extinction is produced by newly formed dust. Further multiband observations are required in order to confirm the identification of the object as the companion star. If confirmed, the companion star would already be dominant in the UV/optical regime, so it would readily provide a unique opportunity to perform a detailed study of its properties.

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