[astro-ph.EP] Ultra-short-period (USP) rocky exoplanets can have dayside temperatures high enough to maintain permanent magma oceans, sitting at the intersection of interior geophysics and atmospheric chemistry. Coupled feedbacks between the […]
2026
Posted inAstrochemistry
Thioacetaldehyde (CH3CHS) On Interstellar Ices: A Key Molecule To Unravel Two Chemical Dichotomies In The ISM
[astro-ph.GA] Thioacetaldehyde (CH3CHS), recently detected in TMC-1, has an abundance approximately 36 times lower than its oxygen analog, acetaldehyde (CH3CHO). This makes the CH3CHS/CH3CHO pair the one with the largest […]
Posted inAstrochemistry
Interstellar Disparity: N- vs O-bearing Molecules: A Multidisciplinary Perspective across Interstellar Environments
[astro-ph.GA] Observations of O- and N-bearing molecules reveal systematic chemical differentiation across a wide range of interstellar environments.
Posted inBrown Dwarfs
Water Cloud and Chemical Modulations in the Coldest Brown Dwarf
[astro-ph.EP] We present high signal-to-noise, medium resolution (R ~ 1000), time-series JWST/NIRSpec spectra of WISE 0855 (265K), the coldest known brown dwarf.
![JWST MIRI images of the HD 101452 system before and after PSF subtraction. The top row shows 100×100 pixel cutouts of the MIRI images centered on HD 101452 prior to PSF subtraction. The bottom row shows the corresponding PSF-subtracted images. All panels use a common surface brightness scale (-5 to 50 MJy/sr). The companion is detected in all filters at a consistent location with a measured separation of r = 1.276±0.004′′ and position angle θ = 84.3±0.2 ◦ East of North at the time of observation. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/A-Binary-Flux.png?resize=1200%2C719&ssl=1)
Posted inExoplanets, -moons, -comets
A Binary Flux Calibrator Reveals the Scientific Potential of Short-integration JWST MIRI Imaging to Directly Detect sub-Jupiter Exoplanets
[astro-ph.EP] We report the direct imaging detection of a stellar companion to HD 101452 (HIP 56925; Gaia DR3 5384905720847544192), an A star historically used as an infrared flux calibrator.
Posted inAI - Data - Apps - Cybernetics, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology
Can AI Detect Life? Lessons From Artificial Life
[cs.LG] Modern machine learning methods have been proposed to detect life in extraterrestrial samples, drawing on their ability to distinguish biotic from abiotic samples based on training models using natural […]
![Schematic representation of the chemical concept explored in this work. (A) Ethanolamine (EtA, NH2CH2CH2OH), methanol (CH3OH), and water (H2O) are subjected to electron irradiation, illustrating the starting molecular components and the formation of an unresolved product inventory after energetic processing. The question mark denotes the chemically diverse products investigated by FTIR, TPD-QMS, and ESI-MS. (B) Structure of the choline cation, [(CH3)3NCH2CH2OH]+ , included as a structurally related reference for assessing methylated EtA-derived and/or choline-like spectral features. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Electron.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry
Electron Irradiation And Temperature-programmed Desorption Of Layered Ethanolamine-water-methanol Ices
[astro-ph.GA]. Ethanolamine (EtA) is a recently detected interstellar complex organic molecule and a potential precursor to more functionalised N-bearing species.
![Surviving CH4 fraction as a function of depth below the surface and effective GCR exposure time. The colour scale gives the CH4 abundance relative to its initial value, while the dashed contours indicate 90%, 50%, and 10% remaining CH4. Vertical dashed lines mark the 3σ viable GCR exposure range of 0.87 - 3.12 Gyr. Increasing GCR exposure progressively extends CH4 depletion to greater depths while more deeply shielded layers retain a larger fraction of their primordial CH4. --[astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Delayed.png?resize=1200%2C713&ssl=1)
Posted inComets and Asteroids
Delayed Methane Detection in 3I/ATLAS: GCR-Driven Subsurface Stratification and Interstellar Exposure Age Constraints
[astro-ph.EP] Interstellar comet 3I/ATLAS shows unusual volatile activity, including strong H2O, CO, and CO2 production and a delayed post-perihelion detection of CH4.
![Radial gas temperature maps for planets within the in-house 3D GCM framework. The panels illustrate equatorial slice plots of (Tgas, pgas) across three global temperature regimes: 800 K (left), 1600 K (center), and 2400 K (right). Host star types vary by row, descending from A-type to G-type and M-type stars [1] -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Faithful.png?resize=1200%2C717&ssl=1)
Posted inExoplanets, -moons, -comets
Faithful Neural Embeddings For 3D Exoplanet Climate Modeling
[astro-ph.EP] With the rapid advancement of telescopes like JWST and Ariel, there is an urgent need for efficient 3D climate models to interpret observations of exoplanet atmospheres.
Posted inComets and Asteroids
Multiband Color Monitoring of 3I/ATLAS Through Ground-Based Relay Observations
[astro-ph.EP] We present multiband, long-baseline photometric observations of interstellar comet 3I throughout its 2025–2026 apparition using coordinated ground-based global relay observations.