A small survey of the magnetic fields of planet-host stars
A small survey of the magnetic fields of planet-host stars
复制标题
对行星主星磁场的小型调查
DOI：
10.1093/mnras/stt1386
复制
发表时间：
2013
影响因子：
4.8
通讯作者：
M. Deleuil
中科院分区：
文献类型：
--
作者：
R. Fares;C. Moutou;J. Donati;C. Català;E. Shkolnik;M. Jardine;A. Cameron;M. Deleuil
使用光谱偏振法，我们研究了拥有近距离系外行星的恒星的大规模磁拓扑。 2006 年至 2011 年间，使用伯纳德·利奥特望远镜 /NARVAL 望远镜和加拿大-法国-夏威夷望远镜 /ESPaDOnS 对 10 颗恒星进行了小型调查。每个目标都包含覆盖 7-22 天的圆偏振观测。对于检测到磁场的七个目标中的每一个，我们使用塞曼多普勒成像重建了磁场拓扑。否则，已估计检测限。提出了对 tau Boo 的三个新纪元的观测，证实了磁极性反转。我们估计周期为 2 年，但仍不能排除更短的 240 天。我们的调查结果与质量旋转图中恒星磁场特性的全局图进行了比较。比较表明，这些巨大的行星宿主恒星往往具有与未检测到热木星的恒星相似的磁场拓扑。这需要用更大的恒星样本来证实。
Using spectropolarimetry, we investigate the large-scale magnetic topologies of stars hosting close-in exoplanets. A small survey of 10 stars has been done with the twin instruments Telescope Bernard Lyot /NARVAL and Canada-France-Hawaii Telescope/ESPaDOnS between 2006 and 2011. Each target consists of circular polarization observations covering 7-22 d. For each of the seven targets in which a magnetic field was detected, we reconstructed the magnetic field topology using Zeeman-Doppler imaging. Otherwise, a detection limit has been estimated. Three new epochs of observations of tau Boo are presented, which confirm magnetic polarity reversal. We estimate that the cycle period is 2 yr, but recall that a shorter period of 240 d cannot still be ruled out. The result of our survey is compared to the global picture of stellar magnetic field properties in the mass-rotation diagram. The comparison shows that these giant planet-host stars tend to have similar magnetic field topologies to stars without detected hot Jupiters. This needs to be confirmed with a larger sample of stars.