I describe a new method of estimating the prevalence of life in the Universe, based on the fact that more chemically complex environments are more rare. The paper makes three […]
chemistry
Posted inBiochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Origin & Evolution of Life, Status Report
Experimentally Measured Assembly Indices Are Required To Determine The Threshold For Life
Assembly theory (AT) aims to distinguish living from non-living systems by explaining and quantifying selection and evolution.
Posted inAI - Data - Apps - Cybernetics, Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Status Report
easyCHEM: A Python Package For Calculating Chemical Equilibrium Abundances In Exoplanet Atmospheres
For modeling the spectra of exoplanets one must know their atmospheric composition. This is necessary because the abundance of molecules, atoms, ions and condensates is needed to construct the total […]
Posted inAstrobiology (general), Conferences and Meetings, Courses, Education and Outreach, Status Report
RED25: An Astrobiology Introductory Course
RED is a Training School about the “Basics in Astrobiology”. Astrobiology addresses questions related to the origins of life, its evolution, and distribution in the Universe. This school aims to […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Thermal Emission Spectrum of the Nearby Rocky Exoplanet LTT 1445A b from JWST MIRI/LRS
The nearby transiting rocky exoplanet LTT 1445A b presents an ideal target for studying atmospheric retention in terrestrial planets orbiting M dwarfs. It is cooler than many rocky exoplanets yet […]
![[C/Fe], [N/Fe], and [O/Fe] abundances and C/O and N/O ratios as functions of [Fe/H] for observed dwarfs (left panel) and giants (right panel). Thin disc planet-hosting stars are represented by green circles, while pink circles indicate stars from the thick disc. Circles filled with both colours represent "in between stars" to thin and thick discs. The (coloured) diamond symbols represent the planets-hosts from Tautvaišiene et al. ˙ (2022). The comparison sample results are taken from Stonkute et al. (2020); Tautvaišien ˙ e et al. (2022) and indicated by empty grey squares (thin ˙ disc) and triangles (thick disc). -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/10/Chemical-Composition-of-Planetary-Hosts.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Status Report, Stellar Cartography
Chemical Composition of Planetary Hosts: C, N, and a-element Abundances
Accurate atmospheric parameters and chemical composition of planet-hosting stars are crucial for characterising exoplanets and understanding their formation and evolution.
Posted inAstrochemistry, Astronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report
Proposed Importance Of HOCO Chemistry: Inefficient Formation Of CO2 From CO And OH Reactions On Ice Dust
With the advent of JWST ice observations, dedicated studies on the formation reactions of detected molecules are becoming increasingly important. One of the most interesting molecules in interstellar ice is […]
Posted inAstrochemistry, Biochemistry & Organic Chemistry, Meteorites & Asteroids, Nanotechnology & SynBio, Origin & Evolution of Life, Status Report
Creation of an Fe3P Schreibersite Density Functional Tight Binding Model for Astrobiological Simulations
The mineral schreibersite, e.g., Fe3P, is commonly found in iron-rich meteorites and could have served as an abiotic phosphorus source for prebiotic chemistry.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report
A Yebes W band Line Survey Towards an Unshocked Molecular Cloud of Supernova Remnant 3C391: Evidence of Cosmic-Ray-Induced Chemistry
Cosmic rays (CRs) have strong influences on the chemistry of dense molecular clouds (MCs). To study the detailed chemistry induced by CRs, we conducted a Yebes W band line survey […]
![BSSE-corrected BE values of all the 75 d-H positions considering the 9 different ASW [H2O]20 clusters. The corresponding values are tabulated in Table A.2. -- astro-ph.GA](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/08/Assessing-realistic-binding-energies.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Interstellar, Status Report
Assessing Realistic Binding Energies of Some Essential Interstellar Radicals with Amorphous Solid Water: A Fully Quantum Chemical Approach
In the absence of laboratory data, state-of-the-art quantum chemical approaches can provide estimates on the binding energy (BE) of interstellar species with grains. Without BE values, contemporary astrochemical models are […]