[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 […]
Astronomy & Telescopes
![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 inHabitable Zones
Planetary Stability and Long-Term Habitability in Nearby Stellar Binaries: 70 Oph, 36 Oph, γ Leo
[astro-ph.EP] Binary stars are common and have the potential to host habitable planets, which may reside in more complex habitable zones as compared to planets orbiting single stars.
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 […]
![Left panel: Toomre diagram for the stars in our sample, color-coded by the TD/D value. Right panel: cumulative distribution function (CDF) of the TD/D values for stars with planetary systems classified into different categories. A system with at least one planet pair that is identified as plausible 1st-order (2nd-order) resonance by HS24 is labeled “w/ 1st MMR” (“w/ 2nd MMR”). The category, “w/ 1st MMR & Pin < 3 d”, corresponds approximately to the stars with plausibly 1st-order resonant and tidal decay timescale τe < 20 Myr in HS24. “USP” is the sample of planetary systems hosting ultra-short-period planets as identified in Schmidt et al. (2024).-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Are-Near.png?resize=1200%2C720&ssl=1)
Posted inExoplanets, -moons, -comets
Are Near Resonant Multiple-planet Systems From Kepler Young?
[astro-ph.EP] Recent studies have claimed that Kepler multi-planet systems hosting near-resonant planet pairs—particularly those near second-order mean-motion resonances (MMRs)—exhibit smaller stellar velocity dispersions than the general population of Kepler planet […]
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 […]
![CH Ind timing and inference. Top: the six differential nodes 𝐷 from equation (1); subtracting primary and secondary O–C values removes their common ephemeris or LTTE trend and isolates the first-order apsidal signal. Bottom: Monte Carlo posteriors for the displayed 0.08-dex common log 𝑘2 systematic; horizontal segments show central 68 per cent intervals.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Stellar-Tidal.png?resize=1200%2C718&ssl=1)
Posted inStellar Cartography
Stellar Tidal Systematics In Apsidal-motion Searches For Circumbinary Planets: CH Ind And SW CMa
[astro-ph.EP] Thornton et al. (2026) reported 27 non-transiting circumbinary-planet candidates from excess apsidal motion in TESS eclipsing-binary timings. The classical stellar contribution is sensitive to target-specific radii, apsidal constants k2, […]
Posted inPress Release
Habitable Worlds Observatory’s Concept and Technology Maturation: Initial Feasibility and Trade Space Exploration
[astro-ph.IM] The Habitable Worlds Observatory is the first telescope ever designed to search for life and will be a powerhouse of discovery across topics in astrophysics.
Posted inAstronomy & Telescopes
First Look at a Time-Series Observation with New NIRISS SOSS Multistripe Subarrays
[STScI] Beginning in Cycle 5, NIRISS SOSS enabled four new “multistripe” subarrays that facilitate faster readouts of the standard SUBSTRIP256 subarray footprint. At their limit, these subarrays enable unsaturated observations […]