This paper presents a classification framework for the architectures of planetary systems based on a complete survey of the confirmed exoplanet population.
![The jet stream probed by sodium. (a) Diagram of the viewing geometry of WASP-121 b during the morning and evening segment (left and right) (not to scale) highlighting the three probing species and their movement direction over the planet’s surface. The polar view is shown with the observer on the bottom and the host star on the top. The parts of the line of sight obscured by the planetary disk are shaded in grey, the night side of the planet is line-hatched. Dark grey indicates likely night-side cloud cover as modelled for WASP-121 b in [20], see Methods 6 for details. The direction of planetary rotation (assumed from synchronous rotation with the star) is shown as a black arrow around the pole, planetary winds are shown as arrows with the colour indicating the probing element (light green: Fe I, yellow: Na I, dark blue: Hα). The rough shape of the atmosphere as derived from Wardenier et al. [18] is shown as black dashed outlines. The trailing and leading limb are marked as well as the evening terminator (e) and the morning terminator (m) where the transition from permanent day- to night-side occurs and vice versa. The angle indicates the angle of the viewing geometry as described in the manuscript. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/02/Vertical-Structure-Of-An-Exoplanet.png?resize=1200%2C712&ssl=1)
Ultra-hot Jupiters, an extreme class of planets not found in our solar system, provide a unique window into atmospheric processes.
The first discovered interstellar small object, `Oumuamua (1I/2017 U1), presents unique physical properties of extremely elongated geometric shape and dual characteristics of an asteroid and a comet.
Highly-irradiated gas giant exoplanets are predicted to show circulation patterns dominated by day-to-night heat transport and a spatial distribution of clouds that is driven by advection and local heating.
Giant planets dominate the mass of many planetary systems, including the Solar System, and represent the best-characterized class of extrasolar planets.
Astronomers have discovered extremely powerful winds pummeling the equator of WASP-127b, a giant exoplanet. Reaching speeds up to 33 000 km/h, the winds make up the fastest jetstream of its […]
The discovery of two new planets beyond our solar system by a team of astronomers from The University of Warwick and the University of Geneva (UNIGE), is challenging scientific understanding […]
![First image of the AO prototype ‘COME–ON’ system taken at 1.52 m telescope of the Observatoire de Haute Provence. γ2 And (a binary star with a 0.5′′ separation) was observed in K band [50]. -- astro-ph.IM](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/01/High-Contrast-Imaging.png?resize=1200%2C719&ssl=1)
So far, most of the about 5,700 exoplanets have been discovered mainly with radial velocity and transit methods. These techniques are sensitive to planets in close orbits, not being able […]
It has been demonstrated that systems of tightly packed inner planets with giant exterior companions tend to have less regular orbital spacings than those without such companions.
The solar system planetary architecture has been proposed to be consistent with the terrestrial and giant planets forming from material rings at ~1 au and ~5 au, respectively.
