Carbonaceous chondrites are samples from planetesimals that formed 2-4 million years after solar system formation began.
accretion disk
![Estimated total mass of transiting compact systems, Mtot, scaled to the stellar mass, M∗. a, (Mtot/M∗) for compact systems having ≥ 3 known planets that orbit a single star within a < 0.5 au (circle markers, blue box). Points are ordered left-to-right by ascending stellar mass. Data are from www.exoplanetarchive.ipac.caltech.edu. For cases without mass estimates, we use the observed planet radius, increase the estimated radius uncertainty by a factor of 2, and then apply a radius vs. mass relation [46]. Light [medium] blue circles are systems with all [some] planetary masses estimated from this relation, while dark blue circles are systems with measured planetary masses. We include only systems with resulting errors ∆Mtot/Mtot < 1. b, Distribution of compact system mass ratios. Over a wide range of stellar masses (M∗ ∼ 0.1 to 1.3 stellar mass), compact multi-planet systems display a common mass ratio, with 90% of systems having 3×10−5 < (Mtot/M∗) < 3×10−4 (gray shaded region). This mass ratio is more similar to that of the gas giant satellite systems (square markers, yellow box) than to the inner or outer planets in our Solar System (triangle markers, red box). -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/06/Origin-of-compact-exoplanetary.png?resize=1200%2C718&ssl=1)
Posted inAstrogeology, Comets and Asteroids, Exoplanets, -moons, -comets, Icy Worlds, Impact events, Status Report
Origin Of Compact Exoplanetary Systems During Disk Infall
Exoplanetary systems that contain multiple planets on short-period orbits appear to be prevalent in the current observed exoplanetary population, yet the processes that give rise to such configurations remain poorly […]
Posted inAstrochemistry, Astrogeology, Exoplanets, -moons, -comets, Status Report
Seven White Dwarfs With Circumstellar Gas Discs II: Tracing The Composition Of Exoplanetary Building Blocks
This second paper presents an in-depth analysis of the composition of the planetary material that has been accreted onto seven white dwarfs with circumstellar dust and gas emission discs with […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Observational Characteristics Of Circum-planetary-mass-object Disks In The Era Of James Webb Space Telescope
Recent observations have confirmed circumplanetary disks (CPDs) embedded in parental protoplanetary disks (PPDs). On the other hand, planetary-mass companions (PMCs) and planetary-mass objects (PMOs) are likely to harbor their own […]