![The per-tile processing chain, applied to the Detector-4 tile of Fig. 1. (a) After flag masking and zodiacal-light subtraction, the input to the stellar subtraction. (b) After fitting and subtracting the empirical PSF at every catalogued source above the magnitude limit, with the saturated cores of the brightest stars masked. (c) After the median filter and the Gaussian smoothing to 2.6 ′ , which is what is coadded into the HEALPix maps. All three panels share a single histogram-equalised colour scale. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/A-Full-Sky.png?resize=1200%2C637&ssl=1)
[astro-ph.GA] Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the interstellar medium and are among its smallest carbonaceous grains.
Imaging & Spectroscopy
Posted inMars
Sulfate Deposits On Iani Chaos On Mars
[NASA/JPL-Caltech/UArizona] This HiRISE image shows light-toned layered deposits within Iani Chaos. Many of the same deposits occur within the depressions of Iani Chaos, as well as several nearby similar regions […]
![Median protoplanetary disk composition predicted by the chemical model at different metallicities [Fe/H]. LEFT: Median overall composition. RIGHT: Median refractory composition. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/On-the.png?resize=1200%2C719&ssl=1)
Posted inInterstellar
On The Compositions Of Interstellar Objects
[astro-ph.EP] As physical samples of distant planetary systems, the compositions of interstellar objects (ISOs) should correlate with the properties of their diverse parent stars.
![Infrared spectra of pure H2S (blue) and H2O:H2S (10:1) (red) ice mixtures after UV irradiation followed by warm-up to room temperature, measured at 300 K. The residue from the H2S ice does not show any IR absorption band. Functional groups assigned to bands in the H2O:H2S (10:1) residue are indicated at the top; vibrational bands and assignments are also listed in Table 1, along with possible carrier species or chemical families producing those features. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Water-.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry
Water Enhances The Formation Of Refractory Sulfur In Interstellar Ices
[astro-ph.GA] Sulfur is the tenth most abundant element in space, yet it is strongly depleted in the gas phase of dense interstellar regions, suggesting sequestration in dust grain components that […]
Posted inAstrochemistry
Chemical Diversity Of Dense Cores In Orion B: The Role Of The Environment
[Astronomy & Astrophysics] Context. Pre-stellar cores are the sites of the earliest stages of star formation. Dust continuum observations are often used to identify and characterise their properties yet only […]
![Rest-frame equivalent widths of C iii] 𝜆𝜆1907, 1909 (left) and C iv 𝜆𝜆1548, 1550 (right) against the direct 𝑇e-based ([O III]𝜆4363) metallicity. Curves are the star-forming photoionisation grids of Nakajima et al. (2018) at a burst age of 1 Myr and log(𝑛H/cm−3 ) = 3. Solid curves represent the POPSTAR single-star models (Mollá et al. 2009), and dashed curves indicate the BPASS binary models (Eldridge et al. 2017), coloured by ionisation parameter as shown in the colour-bar. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Precise.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry
Precise C-N-O Abundances of Individual Galaxies In The First Billion Years From Ultra-Deep, Rest-UV-to-Optical JWST Spectroscopy
[astro-ph.GA] We present ultra-deep JWST/NIRSpec 𝑅 ∼ 1000 spectroscopy of nine star-forming galaxies at 𝑧 = 6.0 − 8.3 in the GOODSN field, drawn from the Origins of Metal Enrichment […]
Posted inAstrochemistry
Secondary Ion-Ice Chemistry in UV-Irradiated Oxygen Ice: New Astrochemical Models Including Bulk Ionic Species
[ACS Earth Space Chemistry] Although energetic and nonenergetic processing of interstellar dust grain surfaces and ice is thought to be one of the dominant mechanisms for the extraterrestrial synthesis of […]
Posted inMars
Following Ancient Rain Toward The Origins Of Life On Mars
[Tohoku University] The Mars we know today is a cold, dry world of dust and rocks. However, around 3.8-3.6 billion years ago, it may have looked very different. Geological and […]
Posted inExoplanets, -moons, -comets
The IAC Presents The SELF Telescope In Italy, A Prototype To Advance The Search For Life On Exoplanets
[IAC] The Instituto de Astrofísica de Canarias (IAC) has presented the progress made on the SELF (Small ExoLife Finder) telescope at the international Charting the Future of Stellar and Exoplanet […]
Posted inTitan
Flow Dynamics Of Cryolava Or Impact Melt On Titan’s surface
[astro-ph.EP] Titan, a unique body in the solar system, resembles a life-size Miller-Urey experiment where pockets of liquid water might interact with abundant organic matter.