![Radius valley plot showing the sub-populations of super-Earths and sub-Neptunes as circles and triangles, respectively. The black line and grey shaded region denote an average radius valley (Ho & Van Eylen 2023) for the population and its 1𝜎 uncertainty region, respectively. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/No-Statistically-.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] The chemical compositions of planets and their hosts stars are intrinsically linked, having formed from the same protostellar material.
Gas Giants
Posted inBrown Dwarfs
Decoding The Weather On Brown Dwarf SIMP 0136
[Trinity College Dublin] Scientists from Trinity College Dublin have developed a powerful way to unravel the changing weather patterns on distant worlds.
Posted inExoplanets, -moons, -comets
The Metallicity Of Giant Exoplanets Around Low-mass Stars And How Ariel Can Help
[astro-ph.EP] Giant planets orbiting low-mass stars represent a unique population of giant planets that can be studied to constrain planet formation theory. Surveys of transiting giant exoplanets around M-dwarfs (GEMS) […]
![[TOP] Marginal posterior probability distribution functions of the Bayesian fit to Eq. 1 when [X/H] is the mean abundance of iron-peak elements (left), volatile elements (middle), and α elements (right). The vertical line indicates the mean of the distribution. [BOTTOM] Same as above but considering only the stars with a spectral type earlier than F5. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Signatures.png?resize=1200%2C718&ssl=1)
Posted inExoplanets, -moons, -comets
Signatures Of Rocky Debris Accretion In AF-Type Planet Hosts
[astro-ph.EP] The gas-giant planet-metallicity correlation plays a fundamental role in our understanding of planet formation.
![Sunburst diagrams describing the evolution of the inner planets (top) and the outer giant planets (bottom) in the DAG simulations. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Effects-of.png?resize=1200%2C717&ssl=1)
Posted inExoplanets, -moons, -comets
Effects Of Outer Giant Planets On In Situ Formation Of Inner Super-Earths
[astro-ph.EP] Recent studies have found an observational correlation between the presence of outer giant planets and inner super-Earths, which implies that outer giants do not suppress the formation of super-Earths.
![The top panel shows comparisons of the observed spectrum of JADES-GS-BD-11 (black with grey 1σ error bars) and the median retrieved spectrum for both the PH3 and non-PH3 petitRADTRANS (red and green, respectively, with 1σ central credible intervals shaded around the median). The bottom panel shows the difference between the retrieved and observed spectra, divided by the observed uncertainty. The two retrieved median spectra are generally within 1σ of each other everywhere except at 4.3 µm (the Q-branch of the PH3 feature).-- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/JWSTNIRSpec.png?resize=1200%2C717&ssl=1)
Posted inBrown Dwarfs
JWST/NIRSpec Spectra for Three Ultracool Brown Dwarfs Detected in Extragalactic Surveys: Further Evidence for Phosphine Absorption
[astro-ph.SR] We present JWST NIRSpec prism spectra for three ultracool brown dwarfs discovered in extragalactic survey data, two from the JWST Advanced Deep Extragalactic Survey (JADES), and one from Public […]
![The mass-radius-period parameter spaces for short-period exoplanets. In (a), the radii and orbital periods of known planets are shown with systems coloured by the stellar effective temperature. The TASSIE II TOIs are highlighted as points with 3σ error bars for their radii. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/The-TASSIE-Program.png?resize=1200%2C719&ssl=1)
Posted inExoplanets, -moons, -comets
The TASSIE Program. II: Three Close-In Companions Orbiting Sun-Like Stars
[astro-ph.EP] We present three southern transiting giant planet candidates alerted by the Transiting Exoplanet Survey Satellite (TESS) mission and investigated at the University of Tasmania Greenhill Observatory (UTGO).
Posted inExoplanets, -moons, -comets
Exploration Of Exoplanet Atmospheres With The James Webb Space Telescope
[astro-ph.EP] The James Webb Space Telescope (JWST) is providing transformative characterization capabilities for the study of both transiting and directly imaged extrasolar planets. Observations deep into the infrared in the […]
Posted inExoplanets, -moons, -comets
JWST Transmission Spectroscopy Of TOI-3235 b: Challenges In Constraining Giant Planet Atmospheres Around M Dwarfs Amid Stellar Contamination
[astro-ph.EP] Giant planets orbiting low-mass M dwarfs challenge current planet formation theories, which predict that such planets are unlikely to form. Characterizing their atmospheres can provide key insight into their […]
Posted inJupiter
Self-consistent 1D Modelling Of Jupiter’s Upper Atmosphere As An Exoplanet Analogue
[astro-ph.EP] Jupiter’s upper atmosphere provides a real-world laboratory for validating first-principles models of giant gaseous exoplanets and for constraining the key physical processes that govern them.