Here we present 19 detections of coherent radio emission associated with known M dwarfs from a blind flux-limited low-frequency survey. Our detections show that coherent radio emission is ubiquitous across the M dwarf main sequence, and that the radio luminosity is independent of known coronal and...
M dwarfs are our galaxy’s silent majority: they constitute 70% of the stars in the Milky Way [43,17] and 40% of its stellar mass budget [44], yet not a single M dwarf is visible to the naked eye. They span nearly an order of magnitude in mass and two orders of magnitude in ...
Metrics Abstract Exoplanet surveys around M dwarfs have detected a growing number of exoplanets with Earth-like insolation. It is expected that some of those planets are rocky planets with the potential for temperate climates favourable to surface liquid water. However, various models predict that te...
<italic>Context.</italic> Observations of rapidly rotating M dwarfs show a broad variety of large-scale magnetic fields encompassing dipole-dominated and multipolar geometries. In dynamo models, the relative importance of inertia in the force balance, wh
Magnetic fields play a fundamental role for interior and atmospheric properties of M dwarfs and greatly influence terrestrial planets orbiting in the habitable zones of these low-mass stars. Determination of the strength and topology of magnetic fields, both on stellar surfaces and throughout the exte...
摘要M型恒星(M dwarf)是主序星中质量较小的恒星,也是银河系中数量最多的恒星 类型,在其周围形成的行星通常距离主星较近,宜居带也比F、G、K型恒星更靠近主星,更有利于发现系外宜居行星.研究表明,M型恒星周围平均存在2.5颗小质量行星,约为 F、G、K型恒星的3.5倍,但M型恒星周围巨行星的出现率(occurrence ...
SpaceChatter Illustration of a red dwarf star orbited by a hypothetical exoplanet. Red dwarfs erupt with intense flares that could strip a nearby planet's atmosphere over time, or make the surface inhospitable to life as we know it. (Credit: NASA/ESA/STScI/G. Bacon)...
根据金属丰度的不同,M型矮星可以分为三类,即金属贫弱的M型矮星(metal-poor M-dwarfs,简称mpM),太阳金属量的M型矮星(solar-metallicity M-dwarfs,简称smM)和金属丰富的M型矮星(metal-rich M-dwarfs,简称mrM)。金属丰度([Fe/H])是指恒星的金属元素相对于氢的丰度,它是研究恒星形成和演化的一个重要指标。在恒星...
In this work, we turn to numerical simulations to investigate stellar winds of M dwarfs. There are still not many numerical studies dedicated to the winds of M dwarfs (e.g. Vidotto et al. 2014; Garraffo, Drake & Cohen 2016; Vidotto & Bourrier 2017). In cool dwarfs, it is common to...
It is clearly established that the Sun has an 11-yr cycle that is caused by its internal magnetic field. Such a cycle is also observed in a sample of M dwarfs. In the framework of exoplanet detection or atmospheric characterisation of exoplanets, the act