M dwarf stars are the most promising hosts for detection and characterization of small and potentially habitable planets, and provide leverage relative to solar-type stars to test models of planet formation and evolution. Using Gaia astrometry, adaptive optics imaging, and calibrated gyrochronologic ...
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 ...
The painstaking and decades-long process of anchoring spectral type in physical properties like mass and radius is described in more detail in Section 2.4. 2.2 M dwarf evolution and lifetimes M dwarfs have rightfully been called “models of persistence” [23]. A scaling argument demonstrates why ...
The painstaking and decades-long process of anchoring spectral type in physical properties like mass and radius is described in more detail in Section 2.4. 2.2 M dwarf evolution and lifetimes M dwarfs have rightfully been called “models of persistence” [23]. A scaling argument demonstrates why ...
In this method, the three-dimensional potential field structure is established analytically by taking the observed stellar radial magnetic field as one boundary condition and supposing that the magnetic field lines become open at a certain distance from the star, called the source surface radius, Rs...
PTF/M-dwarfs is a 100,000-target M-dwarf planetary transit survey, a Key Project of the Palomar Transient Factory (PTF) collaboration. The survey is sensitive to Jupiter-radius planets around all of the target stars, and has sufficient precision to reach Neptunes and super-Earths for the bes...
We found that the size of the chromosphere for M dwarf stars is more extended than that of our present-day Sun. We found that M dwarfs can have a very wide chromosphere extending to 18–174 per cent of the stellar radius and is larger for the low-β regime....
support subglacial liquid water and life. Planets within the HZ of M-dwarf stars (cooler and much less luminous than our sun) or closer to their host star are likely to be tidally locked2and may have temperatures adequate for liquid water, at least on part of their surface, under a broad...
Our H伪 emission light curve shows evidence for rotational modulation suggesting the presence of localized structure in the chromosphere of this M dwarf. The radius of the M4 dwarf derived from the rotational period and the projected equatorial velocity is at least 30% larger than that predicted ...
appropriate amounts of seawater for habitability. Such an occurrence rate would be high enough to detect potentially habitable planets by ongoing and near-future M-dwarf planet survey missions. Access options Additional access options: Log in