[astro-ph.EP] JWST has enabled the measurement of carbon, oxygen, and sulfur abundances in the atmospheres of directly imaged planets. Interpretation of these abundances from a planet formation standpoint requires the […]
astrochemistry
![CI mass as a function of radial distance from the host star, for a continuum of solid surface densities. Over-plotted is the FI1 mass (𝑀¤ = 10−9 M⊙ yr−1 ) for a continuum of maximum Stokes numbers, as well as the MFI1 (opaque purple) and MFI2 (dashed red) masses and the PI mass (dotted black). The last three show no continuum of mass distributions, since we vary their initial mutual Hill spacing within the simulation. Thus, all initial simulations begin from the same mass distribution model, albeit with a different number of embryos at different spacings.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Effects-of-Pebble.png?resize=1200%2C715&ssl=1)
Posted inExoplanets, -moons, -comets
Effects Of Pebble Accretion Isolation Mass On Observable Exoplanet Properties
[astro-ph.EP] The Kepler Mission has discovered a plethora of planetary systems with super-Earth sized planets.
![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 […]
Posted inComets and Asteroids
An Enriched Methane D/H Ratio in the Interstellar Object 3I/ATLAS
[astro-ph.EP]. Interstellar objects are interlopers from other planetary systems, and their volatile compositions provide a glimpse into planet formation around their host star.
Posted inAstrochemistry
The Galactic Centre G+0.633-0.0604 Molecular Cloud: A New Gold Mine for Astrochemistry
[astro-ph.GA] Astrochemistry is living a golden age, with more than a quarter of the ~350 molecules in the current interstellar census having been detected over the last three years. One […]
Posted inAstrochemistry
Dust And Water Found Around The Milky Way’s Central Black Hole
[ESA] The new observations provide the most detailed mid-infrared view yet of the highly evolved star IRS 3, which is located just 0.55 light-years from Sagittarius A*, the Milky Way […]
Posted inPhobos
Infrared-to-visible Albedo Ratio Of Phobos: Comparison With Primitive Asteroids
[astro-ph.EP] Aims. The ratio between infrared and visible albedo, pIR/pV, provides a simple proxy for the spectral slope of asteroid surfaces between the visible and near-infrared wavelength ranges. The aim […]
![Ni, Cu and Zn elemental maps of three chondrules from Paris, that show microspherule regions partitioned by zones enriched in siderophile elements (i.e., Fe, Ni, Co, Cu; pink arrows). The color bars reflect μg/g concentrations of the elements. While in BSE mode and lithophile element space, these would appear as single ~300 μm diameter chondrules, they represent aggregates of ~100 μm grape-bunch chondrules (pink spheres), where these microchondrules contained metal-rich rims. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Chondrule.png?resize=1200%2C714&ssl=1)
Posted inAstrogeology
Chondrule Formation In The Outer Disk From The Primary Three-dimensional Chemical Composition Of CM Chondrules
[astro-ph.EP] Chondrules and their associated fine-grained rims record key processes in the early protoplanetary disk, yet the links between chondrule chemistry, morphology, and matrix complementarity remain poorly constrained.
![Mapping of the science cases proposed by the Science Working Groups (center) to the questions and discovery areas identified by Astro2020 (left and right). The transparencies of the lines indicate the number of connections with darker lines indicating stronger links between the SWG and the Astro2020 topic. -- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Early-Exploration.png?resize=1200%2C711&ssl=1)
Posted inAstronomy & Telescopes
Early Exploration Of The Scientific Discovery Space For The Habitable Worlds Observatory
[astro-ph.IM] The Habitable Worlds Observatory (HWO) is a future NASA flagship mission concept identified by the Astro2020 Decadal Survey as the highest priority for large space missions. HWO should conduct […]
Posted inAstrochemistry
Astrochemistry: A Cosmic Recycling System In Action In The Helix Nebula
[Northwestern University] An international team of scientists, including Northwestern University astrophysicists, has captured an unprecedented view of a dying star’s remains in the act of being recycled.