ESA’s Ariel Space Mission will characterise the atmospheres of approximately 1000 exoplanets to quantify population-level trends.
metallicity
Posted inAstrochemistry, Habitable Zones, Status Report
The Habitability Trade-off: Chemical Decoupling And Quenching In Massive Galaxies
Massive galaxies experience complex evolutionary processes, including mergers and gas accretion, which can disrupt the chemical equilibrium between their stellar and gaseous components.
![Stellar [α/Fe] versus [Fe/H] for planet-hosting stars analyzed in this work (orange circles). The heat map represents the density of stars from APOGEE DR17 in the [α/M] vs [Fe/H] parameter space for reference. The black line approximately divides the thin and thick disk populations (below and above the line, respectively) as defined by D. H. Weinberg et al. 2019. The red points represent stars from the SPOCS sample from J. M. Brewer et al. (2016). The Sun is over-plotted for reference. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/05/A-Uniform-Determination.png?resize=1200%2C715&ssl=1)
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
A Uniform Determination Of The Bulk Metallicities And Alpha Enrichments Of Confirmed Exoplanet Systems With TRES
We present a uniform spectroscopic characterization of 625 F, G, and K stars hosting 859 confirmed exoplanets using high-resolution archival optical spectra from the Tillinghast Reflector Echelle Spectrograph (TRES).
Posted inAriel Mission, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Missions & Hardware, Status Report, Stellar Cartography
Ariel Stellar Characterisation IV. Fundamental Parameters Of 18 Hot Stars In The Ariel Mission Candidate Sample
The characterisation of exoplanetary systems depends on the accurate determination of host star parameters.
Posted inAstronomy & Telescopes, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report, Stellar Cartography
Characterizing Six Seismic Solar Analogs Observed By Kepler, K2, And HERMES
Solar analogs, stars that closely match the fundamental properties of the Sun, provide key benchmarks for testing stellar structure and evolution across different ages and activity levels.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release, Space Weather & Heliophysics
A Theoretical Study of the Structure and Elemental Abundances of HD 20794
HD-20794 is a nearby, bright, metal-poor G-type dwarf hosting a compact planetary system, including a super-Earth near the habitable zone.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Status Report
A Second Visit To Eps Ind Ab With JWST: New Photometry Confirms Ammonia And Suggests Thick Clouds In The Exoplanet Atmosphere Of The Closest Super-Jupiter
With JWST, we are directly imaging cold (~200-300K), solar-age giant exoplanets for the first time.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release
Atmospheric Constraints On GJ 1214 b From CRIRES+ And Prospects For Characterisation With ANDES
In this study, we aim to constrain the atmospheric composition of GJ 1214 b using all available transits observed with the upgraded CRIRES+ spectrograph at the VLT by searching for […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Architectures Of Planetary Systems II: Trends With Host Star Mass And Metallicity
The current census of planetary systems displays a wide range of architectures. Extending earlier work, this paper investigates the correlation between our classification framework for these architectures and host stellar […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Status Report
Atmospheric Circulation Of High-Obliquity Mini-Neptunes
With the operation of JWST, atmospheric characterization has now extended to low-mass exoplanets.