Ocean salinity is known to dramatically affect the climates of Earth-like planets orbiting Sun-like stars, with high salinity leading to less ice and higher surface temperature.
M-dwarf
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Status Report
TESS Discovery of Two Super-Earths Orbiting the M-dwarf Stars TOI-6002 and TOI-5713 Near The Radius Valley
We present the validation of two TESS super-Earth candidates transiting the mid-M dwarfs TOI-6002 and TOI-5713 every 10.90 and 10.44 days, respectively. The first star (TOI-6002) is located 32.038±0.019 pc […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Press Release, Radiation, Space Weather & Heliophysics
Understanding The Stellar Flare Risks To Planets That Could Host Life
A groundbreaking study has revealed that red dwarf stars can produce stellar flares that carry far-ultraviolet (far-UV) radiation levels much higher than previously believed. This discovery suggests that the intense […]
Posted inExoplanets, -moons, -comets, Status Report
Rocky Planet Formation In Compact Disks Around M Dwarfs
Rocky planets in compact configurations are the most common ones around M dwarfs. Many disks around very low mass stars (between 0.1 and 0.5 M⊙) are rather compact and small […]
![LEFT: M dwarf abundance distributions for Mg and Si separated according to the kinematic membership of stars in the thick disc (TD), thick disc-thin disc transition (TD-D), thin disc (D), and young disc (YD), following the criteria of Montes et al. (2018) (see text for details). Mean values for each population are indicated by vertical lines. RIGHT: Top panel: [Si/Fe] vs. firon. The target stars are in orange while the black points correspond to the firon values computed from the Adibekyan et al. (2012) abundances. The fit through the M dwarf values is denoted with a blue line. Bottom panel: Histogram for the firon values of our sample. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/07/The-CARMENES-Search-For-Exoplanets-AroundM.png?resize=1200%2C716&ssl=1)
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Imaging & Spectroscopy, Status Report
The CARMENES Search For Exoplanets Around M Dwarfs: Magnesium And Silicon Abundances Of K7-M5.5 Stars
We present the abundances of magnesium (Mg) and silicon (Si) for 314 dwarf stars with spectral types in the interval K7.0-M5.5 (Teff range ~4200-3050 K) observed with the CARMENES high-resolution […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc
We report the discovery of the transiting planet GJ 238 b, with a radius of 0.566±0.014 R⊕ (1.064±0.026 times the radius of Mars) and an orbital period of 1.74 day.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The CARMENES Search for Exoplanets Around M Dwarfs. Revisiting the GJ 581 Multi-planetary System with New Doppler Measurements from CARMENES, HARPS, and HIRES
GJ 581 is a nearby M dwarf known to host a packed multiple planet system with 2 super-Earths and a Neptune-mass planet. We present new orbital analyses of the system, […]
Posted inAstrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Proxima Centauri, Status Report, TRAPPIST-1
STScI Initiates A Concerted Search For Atmospheres Around M-dwarf Exoplanets
The STScI Director, Dr. Jennifer Lotz, has accepted the primary recommendation of the Working Group on Strategic Exoplanet Initiatives , and has decided to proceed with a large-scale survey of […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Status Report, Stellar Cartography
Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology was employed to […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Press Release, TRAPPIST-1
Asymmetries In The Simulated Ozone Distribution On TRAPPIST-1e Due To Orography
TRAPPIST-1e is a tidally locked rocky exoplanet orbiting the habitable zone of an M dwarf star. Upcoming observations are expected to reveal new rocky exoplanets and their atmospheres around M […]