Astrometry from Gaia DR3 has produced a sample of ∼170,000 Keplerian orbital solutions, with many more anticipated in the next few years. These data have enormous potential to constrain the […]
gas giant
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Press Release
The First Young Brown Dwarfs Found Outside Our Home Galaxy?
Picture the outskirts of the Small Magellanic Cloud, a satellite galaxy of our Milky Way, roughly 200 000 light-years from Earth: here lies the young star cluster NGC 602. The […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Gas Giants, Status Report
Circumplanetary Disks Are Rare Around Planets At Large Orbital Radii: A Parameter Survey Of Flow Morphology Around Giant Planets
We investigate how the formation and structure of circumplanetary disks (CPDs) varies with planet mass and protoplanetary disk aspect ratio. Using static mesh refinement and a near-isothermal equation of state, […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gas Giants, Habitable Zones, Ice Giant, Imaging & Spectroscopy, Neptune, Status Report
Effects of Planetary Parameters on Disequilibrium Chemistry in Irradiated Planetary Atmospheres: From Gas Giants to Sub-Neptunes
A primary goal of characterizing exoplanet atmospheres is to constrain planetary bulk properties, such as their metallicity, C/O ratio, and intrinsic heat. However, there are significant uncertainties in many aspects […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Gaia Mission, Gas Giants, Imaging & Spectroscopy, Interstellar, Status Report, Stellar Cartography
A Candidate High-Velocity Exoplanet System In The Galactic Bulge
We present an analysis of adaptive optics (AO) images from the Keck-I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. 2014 reports two distinct […]
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Exoplanets, -moons, -comets, Gas Giants, Status Report
Terrestrial Planet Formation During Giant Planet Formation And Giant Planet Migration I: The First 5 Million Years
Terrestrial planet formation (TPF) is a difficult problem that has vexed researchers for decades. Numerical models are only partially successful at reproducing the orbital architecture of the inner planets, but […]
![Vertical velocity and condensate cross-sections in (x,z) taken in the middle of the y-domain for the adiabatic simulation initialized on the moist adiabat. The top row shows the vertical velocity in [m/s] at different times throughout the CM1 simulation. The bottom row shows the condensate mixing ratio in [g/kg] at different times throughout the CM1 simulation. The vertical velocity cross-sections show clear convective inhibition in the lower atmosphere in all time steps. The corresponding condensate mixing ratio show a condensate formation nearly in the whole domain, but re-evaporation occurs at the boundary between the stable and convection regions. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/10/3D-Modeling-of-Moist-Convective-Inhibition.png?resize=1200%2C718&ssl=1)
Posted inAtmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gas Giants, Habitable Zones, Status Report, Water/Hycean Worlds & Oceanography
3D Modeling of Moist Convective Inhibition in Hydrogen-Dominated Atmospheres
Many planets have hydrogen-dominated atmospheres, including sub-Neptune exoplanets, recently formed planets with primordial atmospheres, and the Solar System’s giant planets. Atmospheric convection behaves differently in hydrogen-rich atmospheres compared to higher […]
Posted inAstrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Press Release
Astronomers Catch A Glimpse Of A Uniquely Inflated And Asymmetric Exoplanet
Astronomers from the University of Arizona, along with an international group of researchers, observed the atmosphere of a hot and uniquely inflated exoplanet using NASA’s James Webb Space Telescope. The […]
Posted inAstrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gas Giants, Jupiter, Saturn, Status Report, Water/Hycean Worlds & Oceanography
A Photochemical PHO Network For Hydrogen-dominated Exoplanet Atmospheres
Due to the detection of phosphine PH3 in the Solar System gas giants Jupiter and Saturn, PH3 has long been suggested to be detectable in exosolar substellar atmospheres too. However, […]
Posted inAstrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Status Report
Warm Jupiters Around M-dwarfs are Great Opportunities for Extensive Chemical, Cloud and Haze Characterisation with JWST
The population of short-period giant exoplanets around M-dwarf stars is slowly rising. These planets present an extraordinary opportunity for atmospheric characterisation and defy our current understanding of planetary formation.