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Nonlinear Alfven Wave Model of Stellar Coronae and Winds from the Sun to M Dwarfs
被引:5
作者:

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机构:
[1] Kyoto Univ, Astron Observ, Kyoto, Japan
关键词:
Stellar winds;
Stellar coronae;
Stellar chromospheres;
M dwarf stars;
Alfven waves;
Magnetohydrodynamics;
EARTH-LIKE EXOPLANETS;
EJECTION CME ACTIVITY;
MASS M-STARS;
TERRESTRIAL EXOPLANETS;
SOLAR-WIND;
HABITABILITY;
PLANETS;
PROPAGATION;
SIMULATIONS;
IDEAL;
D O I:
10.3847/2041-8213/abd3a9
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
An M dwarf's atmosphere and wind are expected to be highly magnetized. The nonlinear propagation of Alfven waves could play a key role in both heating the stellar atmosphere and driving the stellar wind. Using this Alfven wave scenario, we carried out a one-dimensional compressive magnetohydrodynamic simulation to examine the nonlinear propagation of Alfven waves from the M dwarf's photosphere, chromosphere to the corona, and interplanetary space. Based on the simulation results, we developed a semi-empirical method describing the solar and M dwarf's coronal temperature, stellar wind velocity, and wind's mass-loss rate. We find that M dwarfs' coronae tend to be cooler than the solar corona, and that M dwarfs' stellar winds can be characterized as having a faster velocity and much smaller mass-loss rate compared to those of the solar wind.
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