Slingshot prominences: a hidden mass loss mechanism

Slingshot prominences: a hidden mass loss mechanism
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弹弓日珥:隐藏的质量损失机制

DOI:
10.1093/mnras/stab1709
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发表时间:
2021
影响因子:
4.8
通讯作者:
Waugh R
Waugh R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Waugh R

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虽然在M矮星上已经观察到了“弹弓”引力,但大多数理论研究都集中在类似太阳的恒星上。我们提出了一个快速旋转的年轻M-矮星周围的恒星折射率的调查。我们外推的磁场在日冕塞曼多普勒地图和确定的机械稳定性的网站,可能会形成双折射。我们分析了日珥质量,可以支持和纬度范围内,这种材料的分布。我们发现,在这些地图上,大部分日珥质量可能是不可见的观测-通常<1%的过境恒星盘。在快速旋转的M矮星V374 Peg(Prot= 0.45 d)上,我们发现可见的日珥质量仅占总质量的10%左右。单位面积的质量损失率的尺度与X射线表面通量,这是非常接近的观测得出的恒星风的值。这表明日珥抛射可能对整个恒星风损失和自旋下降有重要贡献。在这些恒星的适居带中的赤道轨道上的行星可能会经历由于日珥抛射而导致的星风间歇性增强。在某些恒星上,这可能发生在20%的轨道上。
Whilst ‘slingshot’ prominences have been observed on M-dwarfs, most if not all theoretical studies have focused on solar-like stars. We present an investigation into stellar prominences around rapidly rotating young M-dwarfs. We have extrapolated the magnetic field in the corona from Zeeman-Doppler maps and determined the sites of mechanical stability where prominences may form. We analyse the prominence mass that could be supported and the latitude range over which this material is distributed. We find that for these maps, much of this prominence mass may be invisible to observation – typically <1 per cent transits the stellar disc. On the rapidly rotating M-dwarf V374 Peg (Prot= 0.45 d) where prominences have been observed, we find the visible prominence mass to be around only 10 per cent of the total mass supported. The mass loss rate per unit area for prominences scales with the X-ray surface flux asthat is very close to the observationally derived value for stellar winds. This suggests that prominence ejection may contribute significantly to the overall stellar wind loss and spin-down. A planet in an equatorial orbit in the habitable zone of these stars may experience intermittent enhancements of the stellar wind due to prominence ejections. On some stars, this may occur throughout 20 per cent of the orbit.
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