M-type stars are prime targets for exoplanet searches within their habitable zones (HZs). M-type stars also exhibit significant magnetic flaring activity, especially during the first billion years, which can potentially […]
M-dwarf
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TOI-2407 b: A Warm Neptune In The Desert
We present the validation of TOI-2407 b, a warm Neptune-sized planet with a radius of 4.26 ± 0.26 R⊕, orbiting an early M-type star with a period of 2.7 days […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
Flare Frequency In M dwarfs Belonging To Young Moving Groups
Context. M stars are preferred targets for studying terrestrial exoplanets, for which we hope to obtain their atmosphere spectra in the next decade.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Press Release
A Giant Planet Around A Tiny Star
The host star, TOI-6894, is a red dwarf with only 20% the mass of the Sun, typical of the most common stars in our galaxy. Until now, such low-mass stars […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Hidden Transits: TOI-2285 b is a Warmer sub-Neptune Likely with a Super-Earth Companion
TOI-2285 b is a sub-Neptune-sized planet orbiting a nearby M dwarf, discovered through the TESS photometric survey and ground-based follow-up observations.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
JWST NIRISS Transmission Spectroscopy of the Super-Earth GJ 357b, a Favourable Target for Atmospheric Retention
We present a JWST NIRISS/SOSS transmission spectrum of the super-Earth GJ 357 b: the first atmospheric observation of this exoplanet.
Posted inExoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics, Status Report
Far-ultraviolet Flares and Variability of the Young M dwarf AU Mic: a Non-detection of Planet c in Transit at Lyman-alpha
Atmospheric escape’s potential to shape the exoplanet population motivates detailed observations of systems actively undergoing escape.
Posted inAstronomy & Telescopes, Barnard's Star, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Four Planets Discovered Around Barnard’s Star
Astronomers confirm the existence of small, hot and likely rocky planets by observing the subtle gravitational wobbles of the star they orbit.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Jupiter, Saturn, Status Report
JWST MIRI Imaging Can Directly Detect Exoplanets Of The Same Temperature, Mass, Age, And Orbital Separation As Saturn And Jupiter
NIRCam and MIRI coronagraphy have successfully demonstrated the ability to directly image young sub-Jupiter mass and mature gas-giant exoplanets.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report, Venus, Water/Hycean Worlds & Oceanography
Retention Of Surface Water On Tidally Locked Rocky Planets In The Venus Zone Around M Dwarfs
Terrestrial planets within the Venus zone surrounding M dwarf stars can retain surface ice caps on the perpetual dark side if atmospheric heat transport is inefficient, (as suggested by previous […]