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arXiv 1202.1874astro-ph.SR
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一颗SU UMa型背景矮新星的偶然开普勒观测

Serendipitous Kepler observations of a background dwarf nova of SU UMa type

Thomas Barclay, Martin Still, Jon M. Jenkins, Steve B. Howell, Rachael M. Roettenbacher

摘要:

我们在开普勒观测数据中发现了一颗SU Uma型矮新星,距离G型系外行星观测目标KIC 4378554约7.0角秒。DN在前景G星的像素孔径中显示为背景源。我们只提取了DN存在的像素,并观察到该源在22个月的时间跨度内经历了五次爆发-一次是超级爆发。超级爆发是由正常爆发触发的,这是开普勒观测到的所有DNe超级爆发中所看到的特征。超级爆发期间的超级峰的周期为1.842+/-0.004小时,我们看到从盘主导的超级峰信号过渡到盘和吸积流的混合影响。根据先前公布的空间密度,开普勒数据中存在的DNe数量的预测从0.3到258不等。背景像素目标的调查将导致DN的空间密度更严格的约束。

英文摘要:

We have discovered a dwarf nova (DN) of type SU UMa in Kepler data which is 7.0 arcsec from the G-type exoplanet survey target KIC 4378554. The DN appears as a background source in the pixel aperture of the foreground G star. We extracted only the pixels where the DN is present and observed the source to undergo five outbursts -- one a superoutburst -- over a timespan of 22 months. The superoutburst was triggered by a normal outburst, a feature that has been seen in all DNe superoutburst observed by Kepler. Superhumps during the super outburst had a period of 1.842+/-0.004 h and we see a transition from disc-dominated superhump signal to a mix of disc and accretion stream impact. Predictions of the number of DNe present in Kepler data based on previously published space densities vary from 0.3 to 258. An investigation of the background pixels targets would lead to firmer constraints on the space density of DN.

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