Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs

被引:53
|
作者
Hall, Oliver J. [1 ,2 ,3 ]
Davies, Guy R. [2 ,3 ]
van Saders, Jennifer [4 ]
Nielsen, Martin B. [2 ,3 ]
Lund, Mikkel N. [3 ]
Chaplin, William J. [2 ,3 ]
Garcia, Rafael A. [5 ,6 ]
Amard, Louis [7 ]
Breimann, Angela A. [7 ]
Khan, Saniya [2 ,3 ]
See, Victor [7 ]
Tayar, Jamie [4 ]
机构
[1] European Space Agcy ESA, European Space Res & Technol Ctr ESTEC, Noordwijk, Netherlands
[2] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England
[3] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark
[4] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
[5] Univ Paris Saclay, IRFU, CEA, Gif Sur Yvette, France
[6] Univ Paris Diderot, Univ Paris Saclay, Sorbonne Paris Cite, AIM,CEA,CNRS, Gif Sur Yvette, France
[7] Univ Exeter, Dept Phys & Astron, Exeter, Devon, England
基金
英国科学技术设施理事会; 新加坡国家研究基金会; 欧洲研究理事会; 欧盟地平线“2020”;
关键词
MAIN-SEQUENCE STARS; SOLAR-TYPE STARS; STELLAR ROTATION; DIFFERENTIAL ROTATION; OSCILLATION FREQUENCIES; COOL STARS; GYROCHRONOLOGY; EVOLUTION; SUN; PERIODS;
D O I
10.1038/s41550-021-01335-x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Main sequence stars older than the Sun have asteroseismically determined rotation rates that depart from standard age-rotation relations, showing support for the concept of weakened magnetic braking. Studies using asteroseismic ages and rotation rates from star-spot rotation have indicated that standard age-rotation relations may break down roughly half way through the main sequence lifetime, a phenomenon referred to as weakened magnetic braking. Although rotation rates from spots can be difficult to determine for older, less active stars, rotational splitting of asteroseismic oscillation frequencies can provide rotation rates for both active and quiescent stars, and so can confirm whether this effect really takes place on the main sequence. We obtained asteroseismic rotation rates of 91 main sequence stars showing high signal-to-noise modes of oscillation. Using these new rotation rates, along with effective temperatures, metallicities and seismic masses and ages, we built a hierarchical Bayesian mixture model to determine whether the ensemble more closely agreed with a standard rotational evolution scenario, or one where weakened magnetic braking takes place. The weakened magnetic braking scenario was found to be 98.4% more likely for our stellar ensemble, adding to the growing body of evidence for this stage of stellar rotational evolution. This work presents a large catalogue of seismic rotation rates for stars on the main sequence, which opens up possibilities for more detailed ensemble analysis of rotational evolution with Kepler.
引用
收藏
页码:707 / +
页数:9
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