When we observe distant celestial objects, there is a possible catch: Is that star I am observing really as reddish as it appears? Or does the star merely look reddish, […]
PAHs
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Interstellar, Status Report
Computing Anharmonic Infrared Spectra of Polycyclic Aromatic Hydrocarbons Using Machine-Learning Molecular Dynamics
Polycyclic aromatic hydrocarbons (PAHs) are key contributors to interstellar aromatic infrared (IR) bands.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report
Theoretical Study of Aromatic and N-heterocycles: Potential Carriers of Interstellar Aromatic Infrared Bands
Heterocycle compounds that contain nitrogen play important roles in astrobiology and terrestrial biology as a building block of nucleic acid. Nitrogen inclusion in polycyclic aromatic hydrocarbons (PAHs) is also proposed […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report
Deuterated Polycyclic Aromatic Hydrocarbons in the Interstellar Medium: Constraints from the Orion Bar as Observed by the James Webb Space Telescope
The gas-phase abundances of deuterium (D) in the local interstellar medium (ISM) exhibit considerable regional variations. Particularly, in some regions the gas-phase D abundances are substantially lower than the primordial […]
![Synthetic spectra for a XPAH = 10−6 at temperatures of 800 K (top), 1200 K (middle), and 1600 K (bottom). Similar to Fig. A1, with constant C/O (0.55) and varying metallicities ([Fe/H]) are displayed for 0.1 (left) in green, 1 (middle) in cyan and 10 (right) in yellow. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/11/Polycyclic-Aromatic-Hydrocarbons-in-Exoplanet-Atmospheres.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Gas Giants, Imaging & Spectroscopy, Status Report
Polycyclic Aromatic Hydrocarbons in Exoplanet Atmospheres: A Detectability Study
In this paper, we explore the detectability of polycyclic aromatic hydrocarbons (PAHs) under diverse planetary conditions, aiming to identify promising targets for future observations of planetary atmospheres.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Press Release, Stellar Cartography
Webb Telescope Observes Organic Astrochemistry In Dwarf Galaxy NGC 4449
Featured in this new image from the NASA/ESA/CSA James Webb Space Telescope is the dwarf galaxy NGC 4449. This galaxy, also known as Caldwell 21, resides roughly 12.5 million light-years […]
Posted inAI - Data - Apps - Cybernetics, Astrochemistry, Biochemistry & Organic Chemistry, Status Report
Machine-learning Identified Molecular Fragments Responsible For Infrared Emission Features Of Polycyclic Aromatic Hydrocarbons
Machine learning feature importance calculations are used to determine the molecular substructures that are responsible for mid and far-infrared (IR) emission features of neutral polycyclic aromatic hydrocarbons (PAHs).
Posted inAstrochemistry, Interstellar, Meteorites & Asteroids, Press Release
Detection of Cosmic Fullerenes in the Almahata Sitta Meteorite: Are They an Interstellar Heritage?
Buckminsterfullerene, C60 , is the largest molecule observed to date in interstellar and circumstellar environments. The mechanism of formation of this molecule is actively debated. Despite targeted searches in primitive […]