arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.06296astro-ph.SR
收藏

利用近距离白矮星+ M矮星对抑制近距离双星的耀斑速率

Using Close White Dwarf + M Dwarf Stellar Pairs to Constrain the Flare Rates in Close Stellar Binaries

Dylan P. Morgan, Andrew A. West, Andrew C. Becker

摘要:

本文研究了M型矮星(dMs)与近距离白矮星(WD)伴星(WD+dM;典型间距< 1 au)的统计耀斑率。我们以前的分析表明,与密切WD同伴的DMs比他们的领域同行更磁活性。有一个近距离的双星伴星的一个可能的含义是通过盘破裂,潮汐效应和/或角动量交换增加恒星旋转;增加恒星旋转长期以来一直与恒星活动的增加有关。先前的研究表明,具有磁活性的dMs(在发射中显示Hα)与恒星耀斑速率的频率之间存在很强的相关性。我们研究的耀斑率之间的差异密切WD+dM的二元系统和现场dMs。我们的样本由Morgan等人(2012)在Sloan Digital Sky Survey Stripe 82中观察到的181个接近WD+dM对的子集组成,在那里我们获得了Sloan ugriz波段的多历元观测。我们发现在接近的WD+dM对中,整体耀斑分数增加(0.09 $\pm$ 0.03%)与田间dM相比(0.0108 $\pm$ 0.0007%; Kowalski等人,2009年)和活性WD+dMs的较低扩口分数(0.05 $\pm$ 0.03%)与活性dMs(0.28 $\pm$ 0.05%; Kowalski et al. 2009)相比。我们讨论了我们的结果如何约束单和二进制dM耀斑速率。我们的研究结果也限制了dM的多重性,我们的知识的银河系瞬态背景,并可能是重要的可居住性出席行星周围的dM与密切的同伴。

英文摘要:

We present a study of the statistical flare rates of M dwarfs (dMs) with close white dwarf (WD) companions (WD+dM; typical separations < 1 au). Our previous analysis demonstrated that dMs with close WD companions are more magnetically active than their field counterparts. One likely implication of having a close binary companion is increased stellar rotation through disk-disruption, tidal effects, and/or angular momentum exchange; increased stellar rotation has long been associated with an increase in stellar activity. Previous studies show a strong correlation between dMs that are magnetically active (showing Hα in emission) and the frequency of stellar flare rates. We examine the difference between the flare rates observed in close WD+dM binary systems and field dMs. Our sample consists of a subset of 181 close WD+dM pairs from Morgan et al. (2012) observed in the Sloan Digital Sky Survey Stripe 82, where we obtain multi-epoch observations in the Sloan ugriz-bands. We find an increase in the overall flaring fraction in the close WD+dM pairs (0.09$\pm$0.03%) compared to the field dMs (0.0108$\pm$0.0007%; Kowalski et al. 2009) and a lower flaring fraction for active WD+dMs (0.05$\pm$0.03%) compared to active dMs (0.28$\pm$0.05%; Kowalski et al. 2009). We discuss how our results constrain both the single and binary dM flare rates. Our results also constrain dM multiplicity, our knowledge of the Galactic transient background, and may be important for the habitability of attending planets around dMs with close companions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑