![Top panel: Comparison of our determined [Fe/H] values (blue line) against the reported metallicity from Mann et al. (2015), Passegger et al. (2019), Maldonado et al. (2020), Marfil et al. (2021) and Cristofari et al. (2022). The red shaded area represents the typical distribution of M dwarfs metallicity from SDSS DR18 (Almeida et al. 2023). Bottom panel: Residuals are plotted to compare the median metallicity values from all referenced studies against each individual work. All measurements are consistent. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/11/Chemical-Fingerprints-of-M-Dwarfs.png?resize=1200%2C717&ssl=1)
We extend the methodology introduced by Jahandar et al. (2024) to determine the effective temperature and chemical abundances of 31 slowly-rotating solar neighborhood M dwarfs (M1-M5) using high-resolution spectra from […]
M-dwarf
Posted inAnalog Studies, Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Status Report
Exo-Daisy World: Revisiting Gaia Theory through An Informational Architecture Perspective
The Daisy World model has long served as a foundational framework for understanding the self-regulation of planetary biospheres, providing insights into the feedback mechanisms that may govern inhabited exoplanets.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Lava / magma ocean / Volcanic Worlds, Press Release, TRAPPIST-1, Water/Hycean Worlds & Oceanography
Rocky Planets Orbiting Small Stars Could Have Stable Atmospheres Needed To Support Life
Since its launch in late 2021, NASA’s James Webb Space Telescope has raised the possibility that we could detect signs of life on exoplanets, or planets outside our solar system.
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Gas Giants, Saturn, Status Report
A Combined 3D Model Applied To Cloudy Warm Saturn Type Exoplanets Around M-dwarfs
Warm Saturn type exoplanets orbiting M-dwarfs are particularly suitable for in-depth cloud characterisation through transmission spectroscopy due to their favourable stellar to planetary radius contrast.
Posted inAstrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Large Interferometer For Exoplanets (LIFE). XIV. Finding Terrestrial Protoplanets In The Galactic Neighborhood
The increased brightness temperature of young rocky protoplanets during their magma ocean epoch makes them potentially amenable to atmospheric characterization to distances from the solar system far greater than thermally […]
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
An HST Transmission Spectrum of the Closest M-Dwarf Transiting Rocky Planet LTT 1445Ab
Which rocky exoplanets have atmospheres, and which do not? This presumably simply question is the first that must be answered in the pathway toward understanding the prevalence of nearby habitable […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Thermal Emission Spectrum of the Nearby Rocky Exoplanet LTT 1445A b from JWST MIRI/LRS
The nearby transiting rocky exoplanet LTT 1445A b presents an ideal target for studying atmospheric retention in terrestrial planets orbiting M dwarfs. It is cooler than many rocky exoplanets yet […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report
TESS Hunt for Young and Maturing Exoplanets (THYME) XII: A Young Mini-Neptune on the Upper Edge of the Radius Valley in the Hyades Cluster
We present the discovery and characterization of TOI-4364 b, a young mini-Neptune in the tidal tails of the Hyades cluster, identified through TESS transit observations and ground-based follow-up photometry.
Posted inBiogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report
Tidal Evolution Of Earth-like Planets In The Habitable Zone Of Low-mass Stars
Earth-like planets in the habitable zone of low-mass stars undergo strong tidal effects that modify their spin states.
Posted inBiochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Extremeophiles and Extreme Environments, Habitable Zones, Imaging & Spectroscopy, Plant Biology, Radiation, Space Weather & Heliophysics, Status Report
Optimizing Photosynthetic Light-harvesting Under Stars: Simple And General Antenna Models
In the next 10–20 years, several observatories will aim to detect the signatures of oxygenic photosynthesis on exoplanets, though targets must be carefully selected. Most known potentially habitable exo-planets orbit […]